Impact of COVID-19 on people with asthma: a mixed methods analysis from a UK wide survey.

INTRODUCTION: The impact of acute COVID-19 on people with asthma appears complex, being moderated by multiple interacting disease-specific, demographic and environmental factors. Research regarding longer-term effects in this group is limited. We aimed to assess impacts of COVID-19 and predictors of persistent symptoms, in people with asthma.
METHODS: Using data from an online UK-wide survey of 4500 people with asthma (median age 50-59 years, 81% female), conducted in October 2020, we undertook a mixed methods analysis of the characteristics and experience of those reporting having had COVID-19.
RESULTS: The COVID-19 group (n=471, 10.5%) reported increased inhaler use and worse asthma management, compared with those not reporting COVID-19, but did not differ by gender, ethnicity or household income. Among the COVID-19 group, 56.1% reported having long COVID, 20.2% were 'unsure'. Those with long COVID were more likely than those without long COVID to describe: their breathing as worse or much worse after their initial illness (73.7% vs 34.8%, p<0.001), increased inhaler use (67.8% vs 34.8%, p<0.001) and worse or much worse asthma management (59.6% vs 25.6%, p<0.001). Having long COVID was not associated with age, gender, ethnicity, UK nation or household income.Analysis of free text survey responses identified three key themes: (1) variable COVID-19 severity, duration and recovery; (2) symptom overlap and interaction between COVID-19 and asthma; (3) barriers to accessing healthcare.
CONCLUSIONS: Persisting symptoms are common in people with asthma following COVID-19. Measures are needed to ensure appropriate healthcare access including clinical evaluation and investigation, to distinguish between COVID-19 symptoms and asthma. © Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

What are the longer-term impacts of COVID-19 on people living with asthma, and which individual characteristics are associated with developing persistent symptoms?

Persisting COVID-19 symptoms are common in people with asthma. COVID-19 severity, duration and recovery are highly variable, with symptoms frequently overlapping and interacting with their pre-existing respiratory condition.

To our knowledge this is the first study to use a mixed methods approach to explore the impact of COVID-19 in people with asthma. Although multiple potentially relevant characteristics were investigated, none were associated with the development of long COVID in our population. The study identifies substantial morbidity in this group, including impacts on breathlessness and asthma control, as well as barriers to accessing healthcare and symptom overlap between asthma and persisting COVID-19 symptoms, all with important implications for management.

Introduction

Tens of millions of people have now had COVID-19, with considerable associated morbidity and mortality. As other coronaviruses are a cause of asthma exacerbations,1 2 concerns have been raised regarding the impact of COVID-19 in people with asthma.3 Initial efforts to address the pandemic have focused on the acute phase of the disease, but the longer-term impacts of the disease have become increasingly apparent under the broad heading of long COVID.4 5 Although an increasing number of studies characterise longer-term impacts of COVID-19 in patients who have been admitted to hospital, the vast majority of people with COVID-19 manage their condition at home.6–8 Such individuals have often not been able to access confirmatory laboratory diagnostic testing due to lack of capacity early in the pandemic, and may experience challenges accessing in-depth clinical assessment and characterisation of their condition.9

The impact of COVID-19 on people with asthma is complex and likely to vary depending on various factors including the underlying phenotype and severity of their asthma,10 how well it is controlled, and the effect of medications including inhaled and oral corticosteroids.11 12 Some research has suggested that certain factors may confer a degree of protection against COVID-19.13 14 However, other studies have suggested people with severe asthma are at an increased risk of death from COVID-19, and asthma increases the risk of requiring critical care among adults admitted to hospital with COVID-19.10 15 16 Overall, undifferentiated asthma does not appear to be associated with an increased risk of death or hospitalisation due to acute COVID-19.11 Research regarding long-term outcomes is limited, though in a population symptom study, asthma was the only pre-existing condition associated with increased risk of developing long COVID.4

Improving understanding of how COVID-19 impacts people with asthma, both acutely and longer-term, is vital to ensure ongoing responses to the pandemic are appropriate.17 Given these gaps in current research, we conducted a mixed methods analysis focusing on the impacts of COVID-19 in people with asthma.

Methods

Study population

The Asthma UK and British Lung Foundation (AUK-BLF) partnership is conducting UK-wide online surveys periodically to assess the impact of the COVID-19 pandemic and measures to mitigate its spread on people with lung disease.18 19 The surveys are distributed via the charity’s (AUK-BLF) mailing lists, websites and social media accounts. Previous studies using data from AUK-BLF surveys helped inform the design of this study.18–21 For this analysis we used data from the survey conducted in October 2020, and focused on people with self-reported COVID-19.

Statistical analysis

Quantitative data were analysed using Stata V.14 (StataCorp). In table 1, data are presented using descriptive statistics. Multiple choice questions were coded as ordinal variables. For the data in table 1, the Kruskal-Wallis test was used to assess for between group differences in the relevant listed variables, defining the groups (dependent variable) by self-reported COVID-19 status (not had COVID-19, not sure if had COVID-19, has had COVID-19), which was treated as an ordinal variable. Independent variables all consisted of two or more categories: age groups, gender, ethnicity, care cancelled yes/no, changes to inhaler use, how has been managing asthma. Long COVID status was defined by the response to the question ‘Do you think you have had ‘long-COVID’?’ with the explanation ‘‘Long-COVID’ is the presence of symptoms (often including fatigue, breathlessness, and muscle aches) for several weeks or months after initially having coronavirus’. In table 2, logistic regression for ordinal/continuous independent variables, or χ2 tests for binary categorical independent variables, were used as appropriate to assess for differences between those reporting long COVID and those not reporting long COVID (dependent variable) in relation to the demographic and disease-related factors listed. Due to small numbers in some categories, gender was collapsed into a binary variable (male or female); ethnicity to white or all other ethnic groups; age groups ‘17 and under’ was collapsed into ‘29 years and under’, and over 80 years collapsed into ‘70 and above’; nation became a binary variable (England or devolved nations), as did having had a COVID-19 test (positive laboratory test or no positive laboratory test). We used an alpha of <0.05 to indicate statistical significance. The p values presented are not adjusted for multiple comparisons. Readers wanting to adjust for multiple comparisons within each table could apply a Bonferroni alpha of 0.008 (0.05 divided by the six variables tested) or 0.006 (0.05 divided by eight variables tested) to results in tables 1 and 2, respectively.

Table 1

Characteristics of survey respondents

	All survey respondents (n=4500)	Not had COVID-19(n=3036)	Not sure if had COVID-19 (n=972)	Had COVID-19(n=471)	P value
Age	N (%)
29 and under	182 (4.09)	122 (4.06)	40 (4.14)	19 (4.09)
30–39	410 (9.20)	260 (8.65)	95 (9.83)	54 (11.64)
40–49	891 (20.00)	541 (18.00)	235 (24.33)	112 (24.14)
50–59	1270 (28.51)	840 (27.95)	280 (28.99)	142 (30.60)
60–69	1085 (24.35)	770 (25.62)	211 (21.84)	101 (21.77)
70 and above	617 (13.85)	472 (15.71)	105 (10.87)	36 (7.76)	p<0.001
Gender
Female	3618 (80.79)	2442 (80.86)	778 (80.21)	382 (81.80)
Male	856 (19.12)	577 (19.11)	190 (19.59)	84 (17.99)
Other	4 (0.09)	1 (0.03)	2 (0.21)	1 (0.21)	p=0.91
Ethnicity
White	4301 (96.41)	2909 (96.77)	930 (96.07)	444 (94.67)
Black or black British	37 (0.83)	21 (0.70)	12 (1.24)	4 (0.85)
Asian or Asian British	70 (1.57)	45 (1.50)	16 (1.65)	9 (1.92)
Mixed	53 (1.19)	31 (1.03)	10 (1.03)	12 (2.56)	p=0.28
Care cancelled
Reported that regular care (eg, an annual review) for my asthma at the GP has been cancelled	902 (20.04)	613 (20.19)	193 (19.86)	93 (19.75)	p=0.98
During lockdown, how has your reliever inhaler use changed?
I have used it more than usual	1689 (39.96)	1031 (35.99)	413 (45.64)	238 (54.34)
I have used it at about the same rate	1824 (43.15)	1332 (46.49)	355 (39.23)	128 (29.22)
I have used it less than usual	587 (13.89)	409 (14.28)	116 (12.82)	60 (13.70)
I do not have a reliever inhaler	127 (3.00)	93 (2.25)	21 (2.32)	12 (2.74)	p<0.001
Since the start of lockdown, how have you been managing your asthma?
Much worse than usual	324 (7.22)	161 (5.32)	84 (8.67)	77 (16.42)
A bit worse than usual	831 (18.52)	502 (16.58)	218 (22.50)	107 (22.81)
About the same	2358 (52.44)	1702 (56.21)	448 (46.23)	197 (42.00)
A bit better than usual	584 (13.02)	401 (13.24)	129 (13.31)	51 (10.87)
Much better than usual	390 (8.69)	262 (8.65)	90 (9.29)	37 (7.89)	p<0.001

P values are for comparison between groups for people reporting they ‘had had’, ‘had not had’ and were ‘not sure if they had had’ COVID-19.

Table 2

Characteristics of people with asthma who reported having had COVID-19

	All with COVID-19 (n=471)	Long COVID(n=261)	Not long COVID(n=210)	P value
Age	N (%)
29 and under	19 (4.09)	12 (4.67)	6 (2.99)
30–39	54 (11.64)	24 (9.34)	28 (13.93)
40–49	112 (24.14)	65 (25.29)	45 (22.39)
50–59	142 (30.60)	78 (30.35)	64 (31.84)
60–69	101 (21.77)	57 (22.18)	43 (21.39)
70 and above	36 (7.76)	21 (8.17)	15 (7.46)	p=0.795
Gender
Female	382 (81.97)	212 (82.17)	166 (82.18)
Male	84 (18.03)	46 (17.83)	36 (17.82)	p=0.998
Ethnicity
White	444 (94.67)	245 (94.59)	194 (95.10)
Ethnic minority	25 (5.33)	14 (5.41)	10 (4.90)	p=0.808
Total annual household income
Below £20 000	116 (25.00)	63 (24.42)	53 (26.50)
£20 000–£30 000	90 (19.40)	54 (20.93)	36 (18.00)
£30 001–£40 000	53 (11.42)	30 (11.63)	21 (10.50)
£40 001–£70 000	74 (15.95)	41 (15.89)	31 (15.50)
Above £70 000	31 (6.68)	8 (3.10)	21 (10.50)
Rather not say	100 (21.55)	62 (24.03)	38 (19.00)	p=0.156
Nation
England	379 (80.98)	209 (80.38)	167 (82.67)
Devolved nations	89 (19.02)	51 (19.62)	35 (17.33)	p=0.531
Had a positive coronavirus test?
Yes	84 (18.18)	52 (20.08)	31 (15.35)
No (includes negative result, tried and could not access one, and no test)	378 (81.82)	207 (79.92)	171 (84.65)	p=0.190
Since the start of lockdown, how have you been managing your asthma?
Much worse than usual	77 (16.42)	69 (26.54)	8 (3.94)
A bit worse than usual	107 (22.81)	60 (23.08)	44 (21.67)
About the same	197 (42.00)	92 (35.38)	104 (51.23)
A bit better than usual	51 (10.87)	25 (9.62)	24 (11.82)
Much better than usual	37 (7.89)	14 (5.38)	23 (11.33)	p<0.001
During lockdown, how has your reliever inhaler (usually your blue inhaler) use changed?
I have used it more than usual	238 (54.34)	162 (67.78)	75 (38.66)
I have used it at about the same rate	128 (29.22)	55 (23.01)	72 (37.11)
I have used it less than usual	60 (13.70)	15 (6.28)	42 (21.65)
I do not have a reliever inhaler	12 (2.74)	7 (2.93)	5 (2.58)	p<0.001
Since recovering from coronavirus, breathing described as
Much better than before	9 (1.94)	1 (0.39)	8 (3.98)
Better than before	7 (1.51)	2 (0.78)	5 (2.49)
About the same	162 (34.84)	59 (22.87)	101 (50.25)
Worse than before	159 (34.19)	97 (37.60)	60 (29.85)
Much worse than before	105 (22.58)	93 (36.05)	10 (4.98)
It is too early to say	23 (4.95)	6 (2.33)	17 (8.46)	p<0.001
Have you had long COVID?
Yes	261 (56.13)	261 (100)
No	110 (23.66)	–	110 (53.92)
Not sure	94 (20.22)	–	94 (46.08)

Totals of less than 471 are due to non-completion of the question. Not long COVID includes those answering ‘no’ n=110; ‘not sure’ n=94 or blank n=6. P values are for univariate logistic regressions (age, income, managing asthma, inhaler use, breathing), or χ2 (gender, ethnicity, nation, positive coronavirus test, having long COVID) tests to assess for differences between those reporting long COVID and those not reporting long COVID.

Thematic analysis

We conducted thematic analysis22 of free-text responses to the question ‘How else would you describe your recovery from coronavirus?’. Initially, these were read and reread for familiarisation and word frequency tables and word clouds were generated NVivo Software (NVivo, 2020) to provide an overview. During the first phases, predominantly open coding was used. These were then refined, using the context from initial readings. Preliminary thematic development was conducted independently by KEJP, SB and PW who then discussed, refined and agreed on the themes. Themes were then reviewed with the other coauthors, with further discussion and reference back to the original data.

Patient and public involvement

Patients and members of the public were not specifically involved in the design, conduct or reporting of this research. However, as the primary focus of this research was to understand the experience of patients and the content of the survey was informed by the views of patients from previous AUK-BLF surveys.

Results

Participants

The survey received 6355 responses (as the survey was publicly accessible, a response rate cannot be reported). Three hundred and nine responses completed on behalf of another person, and 1546 from people who did not have asthma (other long-term respiratory condition or condition not stated) were removed. This left 4500 responses, with 471 (10.5%) from people with self-reported COVID-19 (figure 1).

Figure 1

Participant flow diagram.

Of the 4500 total responses, 81% of respondents were female and median age range was 50–59 years (table 1). Gender, ethnicity, household annual income, were similar between those who ‘had had’, ‘had not had’ and were ‘not sure if they had had’ COVID-19 (table 1). COVID-19 was reported slightly more commonly in younger, than older, age groups, though the median age for each of the COVID-19 status groups was 50–59 years. Twenty per cent of respondents reported having had their regular asthma care cancelled (eg, an annual review at their GP) which was similar between COVID-19 status groupings. 40% of respondents reported increased reliever inhaler use during lockdown (the first and early part of the second UK wide lock-down), and 26% of respondents stated they had been managing their asthma ‘much worse’ or ‘a bit worse’ (figures 2 and 3). Of note, both increased reliever inhaler use and ‘worse’ asthma management were more common in those reporting having had COVID-19 (table 1).

Self-reported asthma management by COVID-19 status.

Change in reliever inhaler use by COVID-19 status.

Characteristics of population reporting COVID-19

The population reporting that they had had COVID-19 (n=471) was 81.8% female, median age 50–59 years, 94.7% white ethnicity, and included a wide age range from all UK nations (England 81%, Scotland 10.3%, Wales 6.4%, Northern Ireland 2.4%) (table 2). During lockdown, 39.2% reported their asthma management had worsened, and 54.3% reported increased inhaler use.

Fifty-six per cent reported having had long COVID (self-reported), 24% not, with a further 20% ‘not sure’. Those who reported long COVID were similar to those who reported not having had or being ‘unsure’ regarding long COVID, for age, gender, ethnicity, UK nation and household income. Compared with those who had not had long COVID and those who were not sure, a higher proportion of individuals who reported that they had long COVID described their breathing as worse or much worse (73.7% vs 34.8%, p<0.001), an increase in reliever inhaler use (67.8% vs 34.8%, p<0.001) and that their asthma management was worse or much worse (59.6% vs 25.6, p<0.001) (table 2) (figures 4–6).

Self-reported asthma management by long COVID status.

Change in reliever inhaler use by long COVID status.

Breathing following COVID-19 by long COVID status.

We repeated the analysis with ‘not sure’ individuals instead classed as having had long COVID, which made no material difference to the results (data not shown).

Patient experience

Analysis of survey responses revealed three key themes about individuals’ experiences following COVID-19 (see figure 7).

Figure 7

Thematic map.

Variable COVID-19 severity, duration and recovery.

Symptom overlap and interaction between COVID-19 and asthma.

Barriers to accessing healthcare.

Theme 1: variable COVID-19 severity, duration and recovery

The severity and duration of symptoms described varied considerably between people. Although many reported a rapid recovery after COVID-19 back to their normal state, around half were experiencing ongoing symptoms weeks to many months later. A full spectrum was reported, some had been asymptomatic (detected on screening) or felt that they had had only very mild disease in the acute phase ‘Only symptoms I had was loss of taste and smell’ (female, aged 30–39), through moderate severity disease, to those requiring intensive care admission.

The trajectory of recovery was also highly variable, with relapsing recoveries being frequently reported, ‘slow and unpredictable’ (female, aged 40–49) with episodic worsening of symptoms after initial improvements ‘It comes and goes in waves’ (female, aged 40–49).

Over half believed that they had long COVID (table 2), with many describing their recovery as ‘slow’ and ‘long’; ‘Struggling with Long Covid for 8 months’ (female, aged 40–49).

As with severity and trajectory, a wide range of symptoms were reported, however fatigue, breathlessness and pain (often chest, or whole body), were most common,

Walking uphill and upstairs or walking at a faster pace more breathless than before, sometimes feel pulse erratic & still have discomfort in right lung (female, aged 60–69)

And

Very draining. Makes day to day living harder. Struggle to do simple things (female, aged 60–69)

Among people with long COVID, some had limited specific symptoms ‘Still loss of smell and taste (everything tastes of salt) since March’ (female, aged 50–59) while for others the ongoing symptoms were more complex, with major impacts on their activities of daily living and quality of life.

Very, very slow, I was knocked off my feet for six months, from the first week of lockdown and only now feel I have any energy to do things – but my breathing is awful. I used to be able to run for 10 miles, now I can’t even manage 10 minutes!! (female, 50–59)

And,

Slow! Still have breathing problems, can’t taste or smell. Headaches all the time. Chest pain. Heartburn. Conjunctivitis that doesn’t go away. Photophobia. Chronic fatigue. Brain fog. Memory problems. Neuropathy in my legs and feet all worse (female, aged 60–69)

Many described a disabling combination of physical and psychological impacts.

Very difficult, mentally and physically. I am now on meds for my mental health due to the stress. I lost weight, muscle and general strength, left with a deficiency feeling in my body, as no system has returned to normal since being ill. (female, aged 18–29)

While others gave very positive reports of their recovery, even after very severe disease during the acute phase.

My recovery, once I recovered from the coma has been quite rapid. After 3 months I am able to walk again. I have no cognitive damage, and no pain in my muscles or joints. The one uncertainty is the condition of my lungs, and how much they will improve, as they were badly damaged by the virus. I currently have regular x-rays, and am monitored by a respiratory team to follow how I am healing. (female, aged 60–69)

Theme 2: symptom overlap and interaction between COVID-19 and asthma

Respondents frequently reported that COVID-19 symptoms overlapped with their asthma, with COVID-19 often seen as causing a protracted asthma exacerbation. Many described COVID-19 as causing a worsening of asthma symptoms, but with additional features atypical of their normal condition ‘My asthma has changed massively’ (female 40–49), and

Usually after a cold I feel my asthma for a week or so, but since being ill in April I have felt my asthma for 6 months—it is getting better though (male, aged 40–49)

And,

I have NEVER had such problems with my asthma or with my oxygen levels. Seven months on, my asthma has still not returned to normal levels and I am still on very high dose of my combined inhaler (female, aged 40–49)

And,

Week 4 recovery and I’m now on daily nebulisers at home and my asthma is much worse with palpitations, fatigue, muscle aches & headache frightened of the whole situation (female, aged 40–49)

Others saw the COVID-19 and asthma as being distinct, but were not able to decide which was the source of their symptoms ‘Unusual in that I get increased breathlessness but don’t know whether this is asthma or not’ (female, aged 40–49).

In addition, psychological impacts such as anxiety were often mentioned, which added further complexity to the overlapping symptoms of COVID-19 and asthma.

The symptoms have exasperated [sic] my anxiety which in turn affects my asthma (female, aged 50–59)

A small number believed they had COVID-19 earlier than the official first UK cases, describing symptoms consistent with severe respiratory infections that they felt were quite different from previous experiences, ‘I am sure I had it in December (2019) as I had all of the symptoms’ (female, aged 50–59). And,

I had an unusual serious asthma attack in January it knocked me out for a few weeks, with significant cough with a dry feeling, loss of taste and smell. Pred[nisolone] and antibiotics helped (male, aged 40–49)

Theme 3: barriers to accessing healthcare

Barriers to accessing and receiving healthcare were commonly reported, especially regarding access to investigations and assessment for COVID-19 related issues. Some felt access to care was limited due to their not ‘being believed’; either that they themselves had had COVID-19 or that long COVID was real. Many people who stated they had long COVID, found it challenging to access the care and support they felt would benefit them ‘Very long and challenging with little support’ (female, aged 30–39) and ‘Very long and ongoing issues. No information or help from GP’ (female, aged 30–39).

These perceived barriers were a source of distress in themselves,

Was very slow, frustrating and worrying. Did not, and still does not, feel like I was being heard or taken seriously by GPs. Was 6+months before I started to see any little bit of improvement in the fatigue and muscle pain. Although better than it was, I am still currently struggling with fatigue and muscle pain. I still feel like I have a constant slight wheeze. Was a real battle getting back into exercising particularly with the breathing issues and had several weeks of that being painful, although I think longer term it did help with the breathing recovery. (female, aged 40–49)

But for some, despite not having confirmatory diagnostic testing earlier in the pandemic, there was a clear perception that healthcare provision for people with long COVID was improving,

I was refused to be tested with extreme shortness of breath and chest pain in March also had upset tummy and burning in my lungs and pain and headaches. I’ve been like this on and off with symptoms since then and the GP thinks it long-COVID but as I was never tested we will never know (female, aged 30–39)

In addition to managing issues attributed to COVID-19 a few people reported disruption to non-COVID-19 related healthcare services ‘[I] have other ongoing medical problems, operation has been put off’ (male, aged 60–69). And, as noted above, 20% reported that aspects of their usual asthma care had been cancelled.

Discussion

The results of this large mixed methods study show that people with asthma who have had COVID-19 commonly report increased reliever inhaler use and poorer asthma management. Around half said that they were experiencing long COVID, the occurrence of which was not associated with personal characteristics including age, gender and ethnicity and household income, despite the impact of these on the risk of acute COVID-19.15 Individual experience of COVID-19 was highly variable, in terms of severity, symptoms and disease trajectory. COVID-19 symptoms overlapped with, and often exacerbated asthma, leaving individuals struggling to understand their symptoms and how best to manage them.

Significance of findings

Although a growing body of research exists focusing on the acute phase of COVID-19, longer-term experience of recovery remains less explored.6 To our knowledge this is the first study to use a mixed methods approach to explore this in people with asthma. The persisting impact of COVID-19 on breathlessness and asthma control has important implications for management. These findings suggest that people with asthma may be particularly susceptible to protracted symptoms due to COVID-19, though this would require confirmation in further studies including non-asthmatic populations for comparison. Regarding the protracted symptoms reported here, it is unclear to what extent they are due to one of the multiple pathological processes implicated in long COVID,9 destabilised asthma, or a combination of factors. Improving access to clinical evaluation and diagnostic services is required to improve understanding and management in this context and the heterogeneity of symptom severities and recovery trajectories underline the need for personalised approaches to assessment and management. The COVID-19 pandemic has led to the suspension of many aspects of routine care for people with long term conditions, including asthma.18 19 The reinstatement of regular reviews of inhaler technique and self-management plans as soon as these can be undertaken safely is important, both for asthma control and to help individuals to clarify the source of their symptoms. Online or remote measures to support people with asthma to manage their condition may be of benefit. Because forced expiratory manoeuvres are considered aerosol generating and increase the risk of coronavirus transmission, access to diagnostic tests has become limited. Since breathlessness and variability of symptoms are established features of both long COVID4 5 and of asthma, every effort to distinguish the two is needed to allow appropriate management. It may be that home peak flow monitoring and better access to exhaled nitric oxide (NO) measurement could serve to distinguish the two conditions. Improving access to clinical evaluation and diagnostic services is required to improve understanding and management in this context and the heterogeneity of symptom severities and recovery trajectories underline the need for personalised approaches to assessment and management.23

In addition to barriers to healthcare, participants reported distress due to not being believed and not having had an initial diagnostic test to confirm that they had had COVID-19. Most had become ill during the first wave of the pandemic when testing was limited almost entirely to hospitalised cases. This is a challenge for both patients and healthcare professionals, though of note, a positive COVID-19 test is not considered a prerequisite for a diagnosis of long COVID.24

Methodological considerations

Thematic analysis on a large dataset, enabled novel exploratory insights into patient experience not readily achievable through other approaches. The size of the sample, and the range of individuals represented, relative to the typically smaller samples used in qualitative research, means that external validity is increased. However, although this study is based on a large sample, it may not be fully representative of all people with asthma in the UK as a degree of selection bias may exist. In particular, the sample contained a relatively low proportion of men and being online is limited by digital literacy and access. The AUK-BLF surveys tend to have a higher proportion of female respondents which is the likely source of the gender imbalance observed in our sample. Similarly, people with a higher burden of enduring symptoms and those more engaged in their asthma management, may have been more likely to participate. Additionally, data were not collected on when the person had symptoms, so it was not always possible to identify precisely how long they had been present for, although the survey date in October makes it likely that most had become unwell during the first wave in the UK which had passed by the beginning of July 2020 when lockdown measures were eased. A positive antigen or antibody test was not required for inclusion in line with relevant clinical guidelines.17 Likewise, the diagnosis of long COVID was based on self-report. As such it is not possible to be completely confident that the prevalence in the sample is representative of all people with asthma in the UK, though of note, of the 4500 people with asthma in the total sample, 471 (10.5%) reported having had COVID-19, which is broadly in line with UK SARS-CoV-2 antibody survey data from the same period.25 Furthermore, although adequate participant characteristics were collected for the purpose of the study, contextual richness was limited compared with what could have been achieved through other more individualised approaches. More detailed markers of acute COVID-19 severity, and asthma severity would have been useful to aid comparison with other studies as would more in-depth demographic information such as the Index of Multiple Deprivation rather than household income level, but these data were not collected. Also, there could be logical justifications for reporting sex, gender, or both sex and gender, however as self-reported gender was the variable collected by the AUK-BLF survey, this is what has been reported in our study.

Conclusion

For many people with asthma, COVID-19 is associated with prolonged symptoms and worsening asthma control. Experiences post-COVID are highly variable and it can be difficult to distinguish symptoms due to COVID-19 from asthma itself. Difficulties accessing appropriate healthcare and a lack of acknowledgement of patients’ condition can both be a source of distress.