More than 28,000 people could become infected with Covid-19 per day over the next month if no disease control measures are put in place.

A senior public health official gave the dire warning on Sunday in light of the current spike in cases, which is thought to be more severe than the previous two upsurges.

The Centre for Covid-19 Situation Administration (CCSA) reported 967 new Covid-19 cases on Sunday, the most ever diagnosed in 24 hours in Thailand.

Sopon Iamsirithaworn, deputy director-general of the Department of Disease Control (DDC), said its epidemiology division in collaboration with the International Health Policy Program had developed a mathematical model to predict the number of people who could become infected per day if safety measures were not observed. In a worst-case scenario with no disease control measures in place, 28,678 people could be infected per day, he said.

However, the average number of daily cases under this scenario would be 9,140, Dr Sopon added, while noting the lowest number could be 1,308 if people do not comply with safety measures.

As of Saturday, for the most recent phase of the outbreak, Bangkok had recorded an accumulated 1,114 infections. Of that number, 823 were linked to night entertainment venues in the capital, and the rest detected during proactive mass testing in communities, Dr Sopon said.

According to CCSA data, infections have been linked to 140 pubs in 15 provinces. Bangkok topped the list with 85 nightspots, led by the Krystal Club in Thong Lor, where 211 infections had been detected since the beginning of this month. Chon Buri recorded 11 infections, Prachuap Khiri Khan recorded nine, Pathum Thani seven and Chiang Mai six.

Dr Sopon said most of the kingdom's new transmissions were linked to pub clusters that have now spread to 70 provinces in the kingdom.