They have raised the issue with the Foreign Ministry and the Tourism Authority of Thailand, reports the Bangkok Post.
Director of Vachira Phuket Hospital, Chalermpong Sukontapol, said on Monday (July 19) that provincial officials had consulted the two government agencies over the conflicting test results.
As of midnight Saturday (July 17), 16 Sandbox tourists had tested positive for COVID-19 since arriving in Phuket. Seven of them were detected at Phuket airport.
Another tourist was detected with the coronavirus about three days after arrival.
Dr Chalermpong said neither he nor provincial governor Narong Woonciew said that issuing of the certificate of entry (COE) needs to be more strictly controlled. But they did question the high number of conflicting test results for people with a COE who are tested again on arrival.
Phuket opened the door to fully vaccinated tourists from July 1. One of the requirements is to obtain a COE from an embassy or consulate to allow them to board a flight to the island. That requires a negative COVID-19 test no more than 72 hours prior to departure.
A total of 7,462 foreign visitors had arrived in the province as of midnight Saturday, according to official figures.