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Thailand Warns Against ‘Overdosing’ on Covid-19 Vaccines

Some Thais say they've already gotten 5 jabs

Thailand Covid-19 Coronavirus Vaccination Vaccine Shot Jab

More is not necessarily better when it comes to coronavirus vaccines, especially if they are administered within a short time.

Dr. Yong Poovorawan, head of the Center of Excellence in Clinical Virology at Chulalongkorn University, wrote on Facebook Thursday that many people have asked about proper doses of Covid-19 vaccines, with some saying they had already received five shots – Two of vaccines made by Sinovac Biotech, followed by a jab of AstraZeneca Plc.’s drug and then two shots of the mRNA vaccine from Moderna Inc.

Some people said they did not count their initial Sinovac jabs, falsely believing them worthless.

Yong likened proper vaccination to filling a glass with water. To cope with Covid-19, people should start with two initial shots, followed by a booster jab, and that would be a “full glass”.

Early injection of the fourth and fifth doses would unnecessarily cause “overflow”, he said. The fourth dose should be administered three to six months after the third shot, he recommended.

Particularly effective vaccines like mRNA ones should be injected six months after the previous shot. Although people did not overdose on a vaccine, they could develop undesirable symptoms, Yong said.