Revista de investigacion clinica; organo del Hospital de Enfermedades de la Nutricion · 2022
Significant Rise in SARS-CoV-2 Reinfection Rate in Vaccinated Hospital Workers during the Omicron Wave: A Prospective Cohort Study.
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Ochoa-Hein Eric, Leal-Morán Patricia E, Nava-Guzmán Karen A, Vargas-Fernández Abril T, Vargas-Fernández José F, Díaz-Rodríguez Fabricio, Rayas-Bernal Joel Armando, González-González Ricardo, Vázquez-González Pavel, Huertas-Jiménez Martha A, Rajme-López Sandra, Ramos-Cervantes Pilar, Ibarra-González Violeta, García-Andrade Luis A, Ledesma-Barrientos Fernando, Ponce-de-León Alfredo, Sifuentes-Osornio José, Galindo-Fraga Arturo
Аннотация
BACKGROUND: Relatively low SARS-CoV-2 reinfection rates have been reported in vaccinated individuals, but updates considering the Omicron variant are lacking.
OBJECTIVES: The objective of the study was to provide a current estimate of the SARS-CoV-2 reinfection rate in a highly immunized population.
METHODS: A prospective cohort of Mexican hospital workers was followed (March 2020-February 2022). Reinfection was defined as the occurrence of two or more episodes of COVID-19 separated by a period of ≥ 90 days without symptoms. The reinfection rate was calculated as the number of reinfection episodes per 100,000 persons per day.
RESULTS: A total of 3732 medical consultations were provided to 2700 workers, of whom 1388 (51.4%) were confirmed COVID-19 cases. A total of 73 reinfection cases were identified, of whom 71 (97.3%) had completed their primary vaccination series and 22 (30.1%) had had a booster dose before the second episode. The overall reinfection rate was 23.1 per 100,000 persons per day (as compared to a rate of 1.9 per 100,000 persons per day before the Omicron wave).
CONCLUSIONS: The SARS-CoV-2 reinfection rate rose significantly during the Omicron wave despite a high primary vaccination coverage rate. Almost one-third of reinfected workers had a vaccine booster ≥ 14 days before the last COVID-19 episode.
OBJECTIVES: The objective of the study was to provide a current estimate of the SARS-CoV-2 reinfection rate in a highly immunized population.
METHODS: A prospective cohort of Mexican hospital workers was followed (March 2020-February 2022). Reinfection was defined as the occurrence of two or more episodes of COVID-19 separated by a period of ≥ 90 days without symptoms. The reinfection rate was calculated as the number of reinfection episodes per 100,000 persons per day.
RESULTS: A total of 3732 medical consultations were provided to 2700 workers, of whom 1388 (51.4%) were confirmed COVID-19 cases. A total of 73 reinfection cases were identified, of whom 71 (97.3%) had completed their primary vaccination series and 22 (30.1%) had had a booster dose before the second episode. The overall reinfection rate was 23.1 per 100,000 persons per day (as compared to a rate of 1.9 per 100,000 persons per day before the Omicron wave).
CONCLUSIONS: The SARS-CoV-2 reinfection rate rose significantly during the Omicron wave despite a high primary vaccination coverage rate. Almost one-third of reinfected workers had a vaccine booster ≥ 14 days before the last COVID-19 episode.