BACKGROUND: Measles control efforts are hindered by challenges in sustaining high vaccination coverage, waning immunity in HIV-1-infected children, and clustering of susceptible individuals. Our aim was to assess population immunity to measles virus after a mass vaccination campaign in a region with high HIV prevalence. METHODS: 3 years after a measles supplemental immunisation activity (SIA), we undertook a cross-sectional survey in Lusaka, Zambia. Households were randomly selected from a satellite image. Children aged 9 months to 5 years from selected households were eligible for enrolment. A questionnaire was administered to the children's caregivers to obtain information about measles vaccination history and history of measles. Oral fluid samples were obtained from children and tested for antibodies to measles virus and HIV-1 by EIA. FINDINGS: 1015 children from 668 residences provided adequate specimens. 853 (84%) children had a history of measles vaccination according to either caregiver report or immunisation card. 679 children (67%) had antibodies to measles virus, and 64 (6%) children had antibodies to HIV-1. Children with antibodies to HIV-1 were as likely to have no history of measles vaccination as those without antibodies to HIV-1 (odds ratio [OR] 1.17, 95% CI 0.57-2.41). Children without measles antibodies were more likely to have never received measles vaccine than those with antibodies (adjusted OR 2.50, 1.69-3.71). In vaccinated children, 33 (61%) of 54 children with antibodies to HIV-1 also had antibodies to measles virus, compared with 568 (71%) of 796 children without antibodies to HIV-1 (p=0.1). INTERPRETATION: 3 years after an SIA, population immunity to measles was insufficient to interrupt measles virus transmission. The use of oral fluid and satellite images for sampling are potential methods to assess population immunity and the timing of SIAs.
BACKGROUND:Measles control efforts are hindered by challenges in sustaining high vaccination coverage, waning immunity in HIV-1-infectedchildren, and clustering of susceptible individuals. Our aim was to assess population immunity to measles virus after a mass vaccination campaign in a region with high HIV prevalence. METHODS: 3 years after a measles supplemental immunisation activity (SIA), we undertook a cross-sectional survey in Lusaka, Zambia. Households were randomly selected from a satellite image. Children aged 9 months to 5 years from selected households were eligible for enrolment. A questionnaire was administered to the children's caregivers to obtain information about measles vaccination history and history of measles. Oral fluid samples were obtained from children and tested for antibodies to measles virus and HIV-1 by EIA. FINDINGS: 1015 children from 668 residences provided adequate specimens. 853 (84%) children had a history of measles vaccination according to either caregiver report or immunisation card. 679 children (67%) had antibodies to measles virus, and 64 (6%) children had antibodies to HIV-1. Children with antibodies to HIV-1 were as likely to have no history of measles vaccination as those without antibodies to HIV-1 (odds ratio [OR] 1.17, 95% CI 0.57-2.41). Children without measles antibodies were more likely to have never received measles vaccine than those with antibodies (adjusted OR 2.50, 1.69-3.71). In vaccinated children, 33 (61%) of 54 children with antibodies to HIV-1 also had antibodies to measles virus, compared with 568 (71%) of 796 children without antibodies to HIV-1 (p=0.1). INTERPRETATION: 3 years after an SIA, population immunity to measles was insufficient to interrupt measles virus transmission. The use of oral fluid and satellite images for sampling are potential methods to assess population immunity and the timing of SIAs.
Authors: Francisco J Luquero; Heloise Pham-Orsetti; D A T Cummings; Philippe E Ngaunji; Marcelino Nimpa; Florence Fermon; Ndong Ngoe; Stephen Sosler; Peter Strebel; Rebecca F Grais Journal: J Infect Dis Date: 2011-07 Impact factor: 5.226
Authors: Ngina Kisangau; Kibet Sergon; Yusuf Ibrahim; Florence Yonga; Daniel Langat; Rosemary Nzunza; Peter Borus; Tura Galgalo; Sara A Lowther Journal: Pan Afr Med J Date: 2018-09-28
Authors: Eleonora A M L Mutsaerts; Marta C Nunes; Martijn N van Rijswijk; Kerstin Klipstein-Grobusch; Diederick E Grobbee; Shabir A Madhi Journal: EClinicalMedicine Date: 2018-07-02
Authors: Karly S Louie; Jama Dalel; Caroline Reuter; Sara L Bissett; Michelle Kleeman; Lesley Ashdown-Barr; Rawinder Banwait; Anna Godi; Peter Sasieni; Simon Beddows Journal: mSphere Date: 2018-05-09 Impact factor: 4.389