NAPA (CBS SF) — Napa County health officials on Sunday confirmed four additional cases of COVID-19 in the county, bringing the total number to 14. All four patients are currently in the city of Napa.

One of the infected patients contracted the virus from travel-related exposure from another country, a county official said. The second person was exposed to a previously confirmed coronavirus case.

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Those two cases are not connected in any way, officials said. Both patients are in isolation and self-quarantining while health officials continue to investigate their cases.

The other two cases are in the same household and are also self-quarantining.

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Napa County announced its first two confirmed coronavirus cases on March 22. Until then, Napa County had been the last Bay Area county to report a confirmed coronavirus case.