There were 54 new Covid-19 fatalities and 6,519 new cases over the past 24 hours, the Public Health Ministry reported on Wednesday morning.
There were 6,464 cases in the general population and 55 among prison inmates.
Over the past 24 hours, 4,148 Covid-19 patients were diagnosed recovered and were discharged from hospitals.
Since April 1, around when the third wave of Covid-19 began, there have been 272,309 Covid-19 patients, 203,745 of whom have recovered.
Since the pandemic started early last year there have been 301,172 Covid-19 cases, 231,171 of whom had recovered.
The death toll was at 2,293 in the third wave and 2,387 from the beginning of the pandemic early last year.
Apisamai Srirangson, assistant spokeswoman for the Centre for Covid-19 Situation Administration, said in the afternoon briefing that the 54 new fatalities were aged 26-89 years. Forty-nine were Thais, three Myanmar, one Lao and one Japanese.
"One in 10 elderly patients are dying. The rate is quite high and vaccination is being accelerated as fast as possible for elderly people,” she said.
Twenty-eight of the latest fatalities had hypertension, but four had no chronic illness. Fifteen either lived in or visited outbreak areas, 11 went to crowded areas and 14 caught the virus from other family members.
Bangkok logged 30 new fatalities, and there were four in Pattani, three each in Samut Prakan and Pathum Thani, two each in Nakhon Ratchasima, Yala and Samut Sakhon, and one each in Chiang Rai, Phetchaburi, Chon Buri, Nakhon Pathom, Chaiyaphum, Narathiwat, Nakhon Si Thammarat and Ayutthaya.
The 6,519 new Covid-19 cases over the previous 24 hours included 6,448 local infections and 16 imported cases. Of the local infections, 4,958 were confirmed at hospitals and 1,490 via mass testing.
Bangkok recorded 1,549 cases, followed by 548 in Samut Prakan, 434 in Samut Sakhon, 266 in Nakhon Pathom, 262 in Chon Buri, 252 in Chachoengsao, 241 in Prachuap Khiri Khan, 235 in Nonthaburi, 212 in Pathum Thani and 190 in Pattani.
Bangkok had 118 clusters of Covid-19 cases including a new cluster of 17 cases at an elderly care centre in Min Buri district.
In Bangkok, 40-50 red-coded patients were waiting for hospital beds, 200-300 yellow-coded patients were waiting every day, Dr Apisamai said.
Since April, Covid-19 infections from Greater Bangkok had spread to 40 provinces, carried by people returning to their homes. There were 218 cases in 17 northeastern provinces, 88 cases in 11 northern provinces, 65 cases in 14 central plain and eastern provinces and six cases in four southern provinces.
The majority of infections in Bangkok were now of the highly contagious Delta variant of the virus and it was spreading to provinces, where it would soon also outnumber Alpha variant infections, Dr Apisamai said.
The 16 imported cases were from the United Arab Emirates (2), Bangladesh (1), the United Kingdom (1), India (5 returnees), Libya (1), Oman (1) and Cambodia (5 including 1 illegal returnee).On Tuesday, 67,614 people received Covid-19 treatment at hospitals. They included 2,496 critically ill patients and 676 dependent on ventilators.
"Previously, those with lung inflammation numbered slightly over 1,000. Now they exceed 2,000. The number of those dependent on ventilators was 300-400. Now there are 676,” Dr Apisamai said.
Earlier about 80% of Covid-19 patients were green-coded, 15% were yellow-coded and 5% were red-coded. Now green patients formed 70%, yellow cases (people starting to be severely ill) accounted for 20% and red cases 10%, she said.
"Four or five in every 10 red-coded patients need ventilators and one or two of every 10 patients dependent on ventilators die," Dr Apisamai said.
Global Covid-19 cases rose by 428,467 in 24 hours to 185.38 million. The worldwide death toll went up by 7,997 to 4.01 million. The United States had the most cases at 34.62 million, up 11,612.