[geomark]

That's what is happening at this moment in Thailand. There were no local transmissions for many months. Borders are closed and anyone coming into the country has to go directly to 14 day quarantine and test clean before they get out. But then some Thais went to Myanmar and snuck back into Chiang Mai in northern Thailand illegally. They were infected and have now spread the infection locally in Thailand to at least a few people. Some cases took flights to Bangkok. There is a frantic effort to track and trace everyone who might have been exposed.