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Volume 28, Supplement—December 2022

Effectiveness of Whole-Virus COVID-19 Vaccine among Healthcare Personnel, Lima, Peru

Carmen S. ArriolaComments to Author , Giselle Soto, Matthew Westercamp, Susan Bollinger, Angelica Espinoza, Max Grogl, Alejandro Llanos-Cuentas, Eduardo Matos, Candice Romero, Maria Silva, Rachel Smith, Natalie Olson, Michael Prouty, Eduardo Azziz-Baumgartner, and Fernanda C. Lessa
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (C.S. Arriola, M. Westercamp, S. Bollinger, R. Smith, N. Olson, E. Azziz-Baumgartner, F.C. Lessa); Naval Medical Research Unit No. 6, Lima, Peru (G. Soto, A. Espinoza, M. Grogl, C. Romero, M. Silva, M. Prouty); Cayetano Heredia Hospital, Lima (A. Llanos-Cuentas); Arzobispo Loayza National Hospital, Lima (E. Matos)

Main Article

Table 2

COVID-19 vaccine effectiveness by number of doses received in a study on effectiveness of whole-virus COVID-19 vaccine among healthcare personnel, Lima, Peru, February 9–May 4, 2021*

Vaccination status†
COVID-19 cases

Non—COVID-19 cases

Vaccine effectiveness, % (95% CI)‡
Received >1 vaccine dose 10 9 138 6 95 (84–99) 97 (88–99)
Fully vaccinated 5 9 36 6 91 (63–98) 95 (70–99)
Partially vaccinated 5 9 25 6 87 (45–97) 100 (88–100)

*Totals exclude persons with reactive SARS-CoV-2 serology (n = 106) and persons with positive COVID-19 test before February 9, 2021 (n = 17). †Persons who tested positive before vaccination date or before the 2-week period after vaccination were considered unvaccinated for the model. We defined full vaccination as the period starting 14 d after receipt of the second dose and partial vaccination as the period starting 14 d after receipt of the first dose. Participants not meeting these criteria were considered unvaccinated. The partial vaccination model only included persons who received 1 dose of the vaccine during the study period. ‡Adjusted for age, sex, exposure to COVID-19 patients, work in the intensive care unit, work in the emergency department, body-mass index, and time of follow-up in days.

Main Article

Page created: August 23, 2022
Page updated: December 11, 2022
Page reviewed: December 11, 2022
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