Outbreak of COVID-19 among vaccinated and unvaccinated homeless shelter residents- Sonoma County, California, July 2021. ” Nine (14%) of 66 fully vaccinated cases, compared with 1 of 50 (2%) of unvaccinated cases, were hospitalized with COVID-19. “

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Abstract

On Saturday, July 3, 2021, the Sonoma County Health Department was alerted to three cases of COVID-19 among residents of a homeless shelter in Santa Rosa, California. Among 153 shelter residents, 83 (54%) were fully vaccinated; 71 (86%) vaccinated residents had received the Janssen COVID-19 vaccine and 12 (14%) received an mRNA (Pfizer BioNTech or Moderna) COVID-19 vaccine. Within 1 month, 116 shelter residents (76%) received positive SARS-CoV-2 test results, including 66 (80%) of 83 fully vaccinated residents and 50 (71%) of 70 residents who were not fully vaccinated. Nine (14%) of 66 fully vaccinated cases, compared with 1 of 50 (2%) of unvaccinated cases, were hospitalized with COVID-19. All hospitalized cases had at least one underlying medical condition. Two deaths occurred, one in a vaccinated resident and one in a resident who was not fully vaccinated. Specimens from 52 residents underwent whole genome sequencing; all were identified as SARS-CoV-2 (the virus that causes COVID-19) AY.13, a sublineage of the B.1.617.2 (Delta) variant. These findings suggest that comprehensive measures including routine testing, individual quarantine, mask wearing, and physical distancing are needed in addition to vaccination in homeless shelters and other similar congregate settings, particularly those with residents who are at high risk for severe COVID-19.

Competing Interest Statement

The authors have declared no competing interest.

Funding Statement

This study did not receive any funding

Author Declarations

I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained.

Yes

The details of the IRB/oversight body that provided approval or exemption for the research described are given below:

The California Department of Health human subjects committee deemed this activity to be non-research. This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy

I confirm that all necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived, and that any patient/participant/sample identifiers included were not known to anyone (e.g., hospital staff, patients or participants themselves) outside the research group so cannot be used to identify individuals.

Yes

I understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance).

Yes

I have followed all appropriate research reporting guidelines and uploaded the relevant EQUATOR Network research reporting checklist(s) and other pertinent material as supplementary files, if applicable.

Yes

Paper in collection COVID-19 SARS-CoV-2 preprints from medRxiv and bioRxiv



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