1. Primary and Secondary Attack Rates by Vaccination Status after a SARS-CoV-2 B.1.617.2 (Delta) Variant Outbreak at a Youth Summer Camp—Texas, June 2021
- Author
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Baker, Julia M, Shah, Melisa M, O’Hegarty, Michelle, Pomeroy, Mary, Keiser, Philip, Ren, Ping, Weaver, Scott C, Maknojia, Sara, Machado, Rafael R G, Mitchell, Brooke M, McConnell, Allan, Tate, Jacqueline E, and Kirking, Hannah L
- Abstract
Children are capable of initiating COVID-19 transmission into households, but many questions remain about the impact of vaccination on transmission. Data from a COVID-19 Delta variant outbreak at an overnight camp in Texas during June 23–27, 2021, were analyzed. The camp had 451 attendees, including 364 youths aged < 18 years and 87 adults. Detailed interviews were conducted with 92 (20.4%) of consenting attendees and 117 household members of interviewed attendees with COVID-19. Among 450 attendees with known case status, the attack rate was 41%, including 42% among youths; attack rates were lower among vaccinated (13%) than among unvaccinated youths (48%). The secondary attack rate was 51% among 115 household contacts of 55 interviewed index patients. Secondary infections occurred in 67% of unvaccinated household members and 33% of fully or partially vaccinated household members. Analyses suggested that household member vaccination and camp attendee masking at home protected against household transmission.Vaccination can limit SARS-CoV-2 transmission among youth in congregate settings and can be used with mitigation measures to decrease secondary transmission.
- Published
- 2022
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