BangkokPost-June 22

The Public Health Ministry is speeding up a study looking into the need for a third Covid-19 vaccine shot for people who are fully vaccinated as certain coronavirus variants are more infectious than others. Along with this study, a ministry committee is tasked with assessing whether it is safe for people to be jabbed using different vaccine brands after the initial first shot is given, said Dr Opas Karnkawinpong, director-general of the Department of Disease Control (DDC) on Monday. Dr Opas, however, insisted it was still too soon to say whether a booster shot is actually needed and if the shot can come from a different manufacturer. Thailand may have to shorten the period between first and second AstraZeneca shots to mitigate the severity expected to be caused by the Delta variant, he said.

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https://www.bangkokpost.com/thailand/general/2136019/boosters-may-be-needed