Mask Effectiveness for Preventing Secondary Cases of COVID-19, Johnson County, Iowa, USA.
Emerg Infect Dis
; 28(1): 69-75, 2022 Jan.
Artículo
en Inglés
| MEDLINE | ID: covidwho-1463442
ABSTRACT
In September of 2020, the Iowa Department of Public Health released guidance stating that persons exposed to someone with coronavirus disease (COVID-19) need not quarantine if the case-patient and the contact wore face masks at the time of exposure. This guidance differed from that issued by the Centers for Disease Control and Prevention. To determine the best action, we matched exposure information from COVID-19 case investigations with reported test results and calculated the secondary attack rates (SARs) after masked and unmasked exposures. Mask use by both parties reduced the SAR by half, from 25.6% to 12.5%. Longer exposure duration significantly increased SARs. Masks significantly reduced virus transmission when worn by both the case-patient and the contact, but SARs for each group were higher than anticipated. This finding suggests that quarantine after COVID-19 exposure is beneficial even if parties wore masks.
Palabras clave
Texto completo:
Disponible
Colección:
Bases de datos internacionales
Base de datos:
MEDLINE
Asunto principal:
COVID-19
Tipo de estudio:
Estudio experimental
/
Estudio observacional
Límite:
Humanos
País/Región como asunto:
America del Norte
Idioma:
Inglés
Revista:
Emerg Infect Dis
Asunto de la revista:
Enfermedades Transmisibles
Año:
2022
Tipo del documento:
Artículo
Similares
MEDLINE
...
LILACS
LIS