A member of the Vaccine Expert Panel said elderly people and those with co-morbidities will experience severe and critical breakthrough infections of the coronavirus disease 2019 (Covid-19) because of their bodies' decreased capability to create a "cell-mediated response".

Dr. Rontgene Solante, who is also an infectious diseases expert, said that this decrease in cell-mediated response among elderly individuals and persons with co-morbidities is a main reason a third, or booster dose of the vaccine is necessary for these groups.

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