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.

READ MORE: Officers Rescue Injured Hawk 'Eddy' In San Francisco's Tenderloin District

COMPLETE COVERAGE: CORONAVIRUS PANDEMIC

READ MORE: CHP: Police Activity Closes Westbound I-80 on Carquinez Bridge

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.

MORE NEWS: Homeland Security Warns Russian-Ukraine Crisis Could Lead to Cyberattacks in U.S.

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.