Covid-19 cases linked to bars, pubs or clubs have spread in 71 provinces so far this month, according to the Centre for Covid-19 Situation Administration.
CCSA spokesman Taweesilp Visanuyothin said on Tuesday there were 6,020 cases to date in April linked to entertainment venues. Bangkok alone logged 1,583 such cases, or 40% of all Covid-19 cases in the capital this month.
In other provinces, cases linked to nightspots comprised 25% of all their Covid-19 cases this month.
Of the 6,020 cases, 3,432 were in the 20-29 age group, Dr Taweesilp said.
Only six provinces remained free of cases linked to entertainment places, to date - Chai Nat, Pattani, Narathiwat, Yala, Satun and Ranong.
Dr Taweesilp said Covid-19 investigation was made difficult because 27% of cases linked to entertainment places withheld information.
The others cooperated, and included 1,157 visitors to entertainment places, 364 staff and 348 people in close contact with infected people.