The Department of Disease Control on Monday warned the public that Covid-19 was again spreading and advised people to be serious about protecting themselves from the disease.
Dr Tares Krassanairawiwong, the director-general, said that last week there were 2,356 Covid-19 inpatients, up by 39% from the previous week.
The number of patients who had lung inflammation and were dependent on ventilators went up about 45%. Related fatalities doubled on a weekly basis.
Of the latest fatalities, 55% were vulnerable and unvaccinated people and the remainder were those whose Covid-19 antibody count had plunged since being vaccinated or infected more than six months ago, Dr Tares said.
He said people should get Covid-19 and influenza vaccines simultaneously to reduce the risk of severe illness from both diseases.
The covid virus has again been spreading since the Songkran festival in mid-April.