tetano
Editor, Senior Moderator
Emerg Infect Dis
. 2022 Aug 15;28(10).
doi: 10.3201/eid2810.221045. Online ahead of print.
Rapid Increase in Suspected SARS-CoV-2 Reinfections, Clark County, Nevada, USA, December 2021
Jeanne Ruff, Ying Zhang, Matthew Kappel, Sfurti Rathi, Kellie Watkins, Lei Zhang, Cassius Lockett
Abstract
Genetic differences between SARS-CoV-2 variants raise concerns about reinfection. Public health authorities monitored the incidence of suspected reinfection in Clark County, Nevada, USA, during March 2020-March 2022. Suspected reinfections, defined as a second positive PCR test collected >90 days after an initial positive test, were monitored through an electronic disease surveillance system. We calculated the proportion of all new cases per week that were suspected reinfections and rates per 1,000 previously infected persons by demographic groups. The rate of suspected reinfection remained <2.7% until December 2021, then increased to ≈11%, corresponding with local Omicron variant detection. Reinfection rates were higher among adults 18-50 years of age, women, and minority groups, especially persons identifying as American Indian/Alaska Native. Suspected reinfection became more common in Clark County after introduction of the Omicron variant, and some demographic groups are disproportionately affected. Public health surveillance could clarify the SARS-CoV-2 reinfection burden in communities.
Keywords: COVID-19; Nevada; Omicron variant; SARS; SARS-CoV-2; United States; coronavirus; coronavirus disease; reinfection; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.
. 2022 Aug 15;28(10).
doi: 10.3201/eid2810.221045. Online ahead of print.
Rapid Increase in Suspected SARS-CoV-2 Reinfections, Clark County, Nevada, USA, December 2021
Jeanne Ruff, Ying Zhang, Matthew Kappel, Sfurti Rathi, Kellie Watkins, Lei Zhang, Cassius Lockett
- PMID: 35969420
- DOI: 10.3201/eid2810.221045
Abstract
Genetic differences between SARS-CoV-2 variants raise concerns about reinfection. Public health authorities monitored the incidence of suspected reinfection in Clark County, Nevada, USA, during March 2020-March 2022. Suspected reinfections, defined as a second positive PCR test collected >90 days after an initial positive test, were monitored through an electronic disease surveillance system. We calculated the proportion of all new cases per week that were suspected reinfections and rates per 1,000 previously infected persons by demographic groups. The rate of suspected reinfection remained <2.7% until December 2021, then increased to ≈11%, corresponding with local Omicron variant detection. Reinfection rates were higher among adults 18-50 years of age, women, and minority groups, especially persons identifying as American Indian/Alaska Native. Suspected reinfection became more common in Clark County after introduction of the Omicron variant, and some demographic groups are disproportionately affected. Public health surveillance could clarify the SARS-CoV-2 reinfection burden in communities.
Keywords: COVID-19; Nevada; Omicron variant; SARS; SARS-CoV-2; United States; coronavirus; coronavirus disease; reinfection; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.