After a second successive day without deaths, the number of fatalities remains at 47, while 1,928 patients have recovered and returned to their homes and 790 are undergoing treatment in hospitals.
Sunday's new cases offered more proof that the Covid-19 curve in Thailand might be flattening.
On April 9 there were 54 new cases, 50 on April 10, 45 on April 11, 33 on April 12, 28 on April 13, 34 on April 14, 30 on April 15, 29 on April 16 ,28 on April 17, and 33 on April 18.
Taweensin said data showed people in the 20-29 age group to be at high risk for infection as they account for one-fourth of the total cases.
He praised Thai people for their cooperation with the government to help flatten the curve, as the number of provinces without new cases has increased. However, the number of confirmed cases in Bangkok and Nonthaburi has started to increase.
The cases can be divided into four groups.
The first group of 18 had close contacts with others previously confirmed as infected (14 in Bangkok).
The second group comprised five people of whom three had worked in crowded areas or close to foreigners, and two went to crowded areas.
The third group of five was under investigation to find the source of the virus.
The last group of four are under state quarantine; one had returned from Indonesia, one from the US, and two from UK.
Meanwhile, 141 people have fully recovered and returned home.
Taweesin urged all recovered people to donate plasma to help improve immunity of current patients, as less than a 100 has been donated so far.
As of April 19, the total number of confirmed cases in the country stood at 2765 -- 790 are under treatment, 1928 have recovered and been discharged, and there have been 47 deaths.
Globally, there are more than 2.3 million confirmed cases and around 160,000 deaths.