Adviser to the Center for COVID-19 Situation Administration (CCSA), Clin. Prof. Dr. Udom Kachintorn, says medical workers who have received two Sinovac doses, will receive a third vaccine shot, also known as a booster, due to the spread of the Delta variant in many areas.
Clin. Prof. Dr. Udom said that the Delta variant, which was first detected in India, is spreading in 96 countries. Two months ago, 85 to 90 percent of COVID-19 infections in Thailand were the Alpha variant, which was first discovered in the United Kingdom (UK). In June and July, 30 percent of the infections in Thailand are the Delta variant. Its transmission rate is very high. Fifty percent of the infections are the Delta variant in greater Bangkok.
The Pfizer and AstraZeneca vaccines are 92 to 96 percent effective in preventing serious illness. There is little information on the Sinovac vaccine, but it is still…
