Timeline of the COVID-19 pandemic in Thailand

One was a local taxi driver who had no records of travelling to China and was thus suspected to have been infected by a Chinese tourist he picked up, making this the first case of human-to-human virus transmission within the country.

[17][18] On 2 February, doctors from the Rajavithi Hospital in Bangkok announced that they had seen the success in treating severe cases of COVID-19 using a combination of drugs for flu (oseltamivir) and HIV (lopinavir and ritonavir), with initial results showing vast improvement 48 hours after applying the treatment.

[21] On 8 February, another six cases were confirmed involving two Chinese, and one passenger on board the evacuation flight from 4 days ago and two other Thais who had exposure to tourists.

[23] On 15 February, the 35th case was found in a 35-year-old Thai woman who worked in a private hospital, marking the first infection in a health worker.

[28] The grandfather was criticised by Public Health Minister Anutin Charnvirakul for initially refusing to disclose his travel history when interrogated by doctors, as he was at risk of becoming a super-spreader.

[30] On 1 March, MOPH reported the first confirmed death in Thailand, a 35-year-old Thai who was originally diagnosed with dengue fever at a private hospital in late January.

[31] On the same day, King Power issued a statement identifying the man who had died as one of the company's partner-product consultants at their Sivaree branch store.

[35] Four medical workers were also announced to have been infected with the virus after coming in contact with patients who refused to reveal their travel history while seeking treatment.

On 15 July, the national centre for COVID-19 has announced two new infected cases; an Egyptian soldier in Rayong Province, and a Sudanese diplomat's daughter in Asok neighbourhood of Bangkok.

Even though there had been no new domestic cases since mid-May, on 21 August, the CCSA announced that it decided to extend the Emergency Decree until 30 September, claiming that it was necessary to use its power to prevent incoming aliens from overseas in many routes, and that Thai people' daily lives were not affected, since CCSI had already loosen its restriction on activities such as academia reopen.

[48] Starting at the end of the month, at least ten cases were detected in Thai women who had illegally crossed the Myanmar border into Mae Sai District from Tachileik.

They made long-distance travels, including by bus and by air, and some attended large gatherings, prompting authorities to impose quarantine on people who may have come into close contact with them.

[49][50] In mid-December, the government announced that they were considering whether to reduce the mandatory quarantine for arrival from 14 to 10 days, in an effort to attract foreign tourists.

[51] Days later, an outbreak occurred in Samut Sakon, just southwest of Bangkok, increasing the country's total confirmed cases by at least 20%.

[61] On 12 March, International School Bangkok of Pak Kret District issued a statement notifying that the grandparent of a student had contracted the virus.

[64] Following panic among the local community, the governor of Nonthaburi clarified that only one building would be used as a quarantine area and dismissed previous rumors that COVID-19 patients were already at the hospital.

[66] Starting from 21 March, the province saw a spike in confirmed cases, primarily related to the Bangkok-area boxing stadium clusters.

[68] On 28 March, the first confirmed death in the province was reported in Sai Ma Subdistrict, Mueang Nonthaburi District, in a 68-year-old Muay Thai pundit classified as part of the Lumpinee Boxing Stadium cluster.

[69] Doctors later revealed that the individual failed to provide adequate details when he initially sought treatment on 13 March and thus were unaware of his travel history to a high-risk area.

[70] On 19 March, Nonthaburi Governor Suchin Chaichumsak announced a provincial lockdown, citing the high population density of the province as one of his main concerns.

[72] Authorities arrested the owner of a restaurant on 22 March for failing to comply with the lockdown measures, in which offenders could face up to one year imprisonment and incur a fine of up to 100,000 baht.

[73] After a new set of positive test results were announced on 23 March, the Nonthaburi Provincial Health Office requested anyone who had been involved in the following activities to self-quarantine at home for 14 days:[74] On 25 March, the Nonthaburi Civic Center station on the MRT Purple Line was closed for disinfection after a staff member tested positive for the virus.

[75] Immediately after the emergency decree took effect at midnight on 26 March, local authorities set up roadblocks along roads in the Pak Kret and Sai Noi Districts, for the purpose of intercepting commuters exhibiting COVID-19-like symptoms to be isolated and examined at hospitals.