Singapore reported 614 new cases of Covid-19 today, tipping the national total past the 30,000 mark.

The vast majority of the Asian city-state’s 30,426 cases are migrant workers living in dormitories, where clusters began emerging last month and have raged on despite authorities’ efforts to clamp down.

The outbreak spiked highest in April, at one point reaching more than 1,000 cases per day for several days straight.

Since then, it has fallen back down slightly — but remains high, with 400 to 800 cases a day.

Some background: Around 1.4 million migrant workers live in Singapore, mostly employed in construction, manual labor and housekeeping. They largely hail from South and Southeast Asian countries, like India and Bangladesh, and make up a significant portion of the Singaporean workforce.

Of these, about 200,000 live in 43 dormitories, according to Minister of Manpower Josephine Teo.

Each dorm room houses about 10 to 20 residents. They share toilet and shower facilities, eat in common areas, and sleep just feet away from each other. It’s nearly impossible to conduct social distancing — the consequences of which are becoming clear.