Explained: Why COVID nasal vaccine can’t be administered after booster dose; other facts to know

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To the question on whether a person can take the nasal vaccine after three doses, Dr Arora says, “as part of the programme, no CoWIN will not accept a fourth dose.”

“Let us assume you want to take another fourth dose. There is a concept what is called as ‘antigen sink’. If a person is repeatedly immunised with a particular type of antigen, the body stops responding, or responds poorly. And that is why initially mRNA vaccines are given with a gap of six months. Later on, people are taking at three-month gap. But it has not helped too much in that case. Therefore, at the moment taking a fourth dose is of no value,” Dr Arora told the media.



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