SAN ANTONIO – The San Antonio Metropolitan Health District is investigating a fourth confirmed travel-related positive COVID-19 case, officials said Monday night. The first positive case in San Antonio involved a flight from California, the second involved a trip to Japan, and the third involved a trip to Spain. “The 4th case is considered travel-related as the source of exposure is known,” he said in a tweet. RELATED: San Antonio doctor tests positive for COVID-19 after travel, quarantining at home[COVID-19 UPDATE] 1/18To date, we have received confirmation of 4 travel-related cases of COVID-19. Abbott declares statewide emergency over coronavirus pandemic· What we know: San Antonio tourism hotspots impacted by the coronavirus