Covid-19 infections continue to surge in Bangkok with 28 clusters now detected across 19 districts.

Prisons and construction camps have been identified as main sources of the latest outbreak.

The capital on Monday logged its highest number of new infections at 1,843. The country-wide total of 9,635 cases was also a record high, with several prisons accounting for 6,853 cases.

Taweesilp Visanuyothin, spokesman for the Centre for Covid-19 Situation Administration (CCSA), said authorities were closely monitoring the infection clusters in the capital, noting that the Bangkok Metropolitan Administration (BMA) has separated the clusters into four categories depending on rate of local transmission and daily new infections.

Attempts to contain the spread of the virus are currently focused on a worker camp in Laksi district, which has reported 885 cases to date. The camp was built by the Italian-Thai Development company to house labourers working at a nearby construction site.

Dr Taweesilp said authorities were concerned as there were 11 subcontractors working at the site and their workers lived across eight camps in the area.

Although the construction site has been sealed off, six camps with 6,000 residents have been told to step up their Covid-19 prevention measures and limit the movement of their residents, he said.

Meanwhile, the Public Health Ministry is planning to inoculate at least five million people by the end of July.

Opas Karnkawinpong, director-general of the Department of Disease Control (DDC), said the DDC woud allocate vaccines to the BMA to ensure 70% of Bangkok's population was vaccinated within two months.

He said the mass vaccination drive would be launched as soon as the AstraZeneca vaccines arrive next month. About 2.5 million people will be given the shots each month, he said.