French Polynesian authorities have put about 300 Chinese tourists under surveillance amid concern about China's coronavirus outbreak.
The tourism ministry said medical centres were in daily contact with the hotels in Tahiti, Moorea and Bora Bora, where the tourists were staying.
The ministry said if any of them was suspected to be carrying the virus, they would be quarantined.
It said so far none of them had shown any symptoms.
The visitors - mainly from Shanghai and Beijing - arrived in Tahiti via Tokyo.
French Polynesia has also tightened access for visitors from Asia.
As of today, anyone arriving via Japan or New Zealand has to show a certificate less than 15 days old that they have no viral infection.
Airlines are advised to refuse travel to anyone failing to produce such proof.
The government has also decided to stop issuing work and residence permits to Chinese citizens and asked residents to defer travel to Asia.
A thermal camera will be installed at the international airport in Tahiti.
People working at the airport and the cruise ship port are to be given safety equipment if they ask for it.
Airport and port operators have to supply means of protection to anyone arriving and not feeling well.
Samoa coronavirus precautions
Meanwhile, Samoa has introduced travel restrictions in response to the global outbreak of coronavirus.
Samoan authorities now require all travellers to undergo a medical clearance at least three days before travelling to the country.
Anyone travelling from a novel coronavirus-affected country must spend 14 days in a non-affected country before entering Samoa or face deportation.
And New Zealand's Ministry of Foreign Affairs and Trade is advising people not to travel to China's Hubei province, the epicentre of the outbreak of the deadly coronavirus.
More than 100 people have now died in China, with confirmed infections surging to more than 4500. The virus has spread across China and to at least 16 countries globally.