Reuters The Thai prime minister and health officials said Monday that foreign workers who entered the country illicitly were the likely source of a record outbreak of coronavirus cases detected at Thailand’s largest seafood market complex, where hundreds of migrants from Myanmar have been infected. Thailand until last Thursday had contained the number of COVID-19 infections to only about 4,200 since the first case was detected here in January – compared with much higher numbers in its neighbors Indonesia, the Philippines and Myanmar. But the caseload shot to nearly 5,300 on Monday after more than 900 cases – mostly among workers from Myanmar – were confirmed at the market complex in Samut Sakhon province, south and west of the greater Bangkok limits, health authorities said.