Disclaimer: Early release articles are not considered as final versions. Any changes will be reflected in the online version in the month the article is officially released.
Volume 28, Number 1—January 2022
Mask Effectiveness for Preventing Secondary Cases of COVID-19, Johnson County, Iowa, USA
Page created: October 12, 2021
Page updated: October 12, 2021
Page reviewed: October 12, 2021
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.