The South Dakota Department of Health is investigating a cluster of COVID-19-positive cases among fully vaccinated residents and staff members at an assisted living community.

The state is sampling positive cases at Leisure Living of Salem, SD, which offers assisted living and independent living, to determine whether a variant or mutation in the coronavirus is responsible for an outbreak in the community, according to a published report.

Terry Sabers, listed as owner of the community, confirmed to the media outlet that several residents had tested positive after being fully vaccinated. According to the community’s Facebook page, first doses were delivered on Jan. 9 and second doses were delivered on Jan. 30. 

The news comes after a Kentucky nursing home experienced a coronavirus outbreak among both vaccinated and unvaccinated residents last month after an unvaccinated person brought a previously unidentified variant into the building.

The Kentucky outbreak reinforced the message that providers must remain vigilant about exposure even after most of their residents have been inoculated.

Leisure Living and state officials had not responded to requests for information by the publication deadline.