The administration of the third dose is recommended for people with severe underlying health conditions and they should receive it within a time-frame defined by doctors who are treating their diseases.
Booster shots are given within a larger time span since the completion of primary inoculation and they are administered to provide extra protection over a longer period of time.
People who have recovered from COVID-19 and have been vaccinated against this infection do not need the third dose, says the HZJZ.
The Comirnaty (Pfizer) vaccine is recommended for additional inoculation and it should be applied after at least six months since the completion of the two-round vaccination.