Hannah E Maier1, Guillermina Kuan2,3, Lionel Gresh2, Roger Lopez2,4, Nery Sanchez2, Amy Schiller1, Sergio Ojeda2, Eva Harris5, Angel Balmaseda2,4, Aubree Gordon1. 1. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA. 2. Sustainable Sciences Institute, Managua, Nicaragua. 3. Centro de Salud Sócrates Flores Vivas, Ministry of Health, Managua, Nicaragua. 4. Centro Nacional de Diagnóstico y Referencia, Ministry of Health, Managua, Nicaragua. 5. Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, Berkeley, California, USA.
Abstract
BACKGROUND: Obesity has been shown to increase the risk of severe outcomes and death for influenza virus infections. However, we do not understand the influence of obesity on susceptibility to infection or on nonsevere influenza outcomes. METHODS: We performed a case-ascertained, community-based study of influenza transmission within households in Nicaragua. To investigate whether obesity increases the likelihood of influenza infection and symptomatic infection we used logistic regression models. RESULTS: Between 2015 and 2018, a total of 335 index cases with influenza A and 1506 of their household contacts were enrolled. Obesity was associated with increased susceptibility to symptomatic H1N1pdm infection among adults (odds ratio [OR], 2.10; 95% confidence interval [CI], 1.08-4.06) but not children, and this association increased with age. Among adults with H1N1pdm infection, obesity was associated with increased likelihood of symptoms (OR, 3.91; 95% CI, 1.55-9.87). For middle-aged and older adults with obesity there was also a slight increase in susceptibility to any H1N1pdm infection (OR, 1.20; 95% CI, .62-2.34). Body mass index (BMI) was also linearly associated with increased susceptibility to symptomatic H1N1pdm infection, primarily among middle-aged and older women (5-unit BMI increase OR, 1.40; 95% CI, 1.00-1.97). Obesity was not associated with increased H3N2 susceptibility or associated symptoms. CONCLUSIONS: We found that, among adults, obesity is associated with susceptibility to H1N1pdm infection and with symptoms associated with H1N1pdm infection, but not with susceptibility to H3N2 infection or associated symptoms. These findings will help target prevention efforts and therapeutics to this high-risk population.
BACKGROUND: Obesity has been shown to increase the risk of severe outcomes and death for influenza virus infections. However, we do not understand the influence of obesity on susceptibility to infection or on nonsevere influenza outcomes. METHODS: We performed a case-ascertained, community-based study of influenza transmission within households in Nicaragua. To investigate whether obesity increases the likelihood of influenza infection and symptomatic infection we used logistic regression models. RESULTS: Between 2015 and 2018, a total of 335 index cases with influenza A and 1506 of their household contacts were enrolled. Obesity was associated with increased susceptibility to symptomatic H1N1pdm infection among adults (odds ratio [OR], 2.10; 95% confidence interval [CI], 1.08-4.06) but not children, and this association increased with age. Among adults with H1N1pdm infection, obesity was associated with increased likelihood of symptoms (OR, 3.91; 95% CI, 1.55-9.87). For middle-aged and older adults with obesity there was also a slight increase in susceptibility to any H1N1pdm infection (OR, 1.20; 95% CI, .62-2.34). Body mass index (BMI) was also linearly associated with increased susceptibility to symptomatic H1N1pdm infection, primarily among middle-aged and older women (5-unit BMI increase OR, 1.40; 95% CI, 1.00-1.97). Obesity was not associated with increased H3N2 susceptibility or associated symptoms. CONCLUSIONS: We found that, among adults, obesity is associated with susceptibility to H1N1pdm infection and with symptoms associated with H1N1pdm infection, but not with susceptibility to H3N2 infection or associated symptoms. These findings will help target prevention efforts and therapeutics to this high-risk population.
Authors: Jennifer Rebeles; William D Green; Yazan Alwarawrah; Amanda G Nichols; William Eisner; Keiko Danzaki; Nancie J MacIver; Melinda A Beck Journal: J Infect Dis Date: 2019-04-19 Impact factor: 5.226
Authors: H K Talbot; L A Coleman; K Crimin; Y Zhu; M T Rock; J Meece; D K Shay; E A Belongia; M R Griffin Journal: Vaccine Date: 2012-04-03 Impact factor: 3.641
Authors: Fatimah S Dawood; Seema Jain; Lyn Finelli; Michael W Shaw; Stephen Lindstrom; Rebecca J Garten; Larisa V Gubareva; Xiyan Xu; Carolyn B Bridges; Timothy M Uyeki Journal: N Engl J Med Date: 2009-05-07 Impact factor: 91.245