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“Protection against infection does decline in the months following a second dose,” Sara Tartof from Kaiser Permanente, US.

Pfizer vaccine highly effective against Covid-19 hospitalizations for 6 months: Study

In some previous reports, it was assessed that Pfizer and Moderna Coronavirus vaccines caused inflammation in the heart muscle.

Covid pose higher risk to heart than Pfizer vaccine reveals study

To contain the spread of the Delta variant, some countries have begun using or are considering the need for booster doses, although scientists are debating whether or not extra shots are required.

WHO asks for a halt on booster shots for Covid delta variant

Issued on Friday, the study implied that the Delta variant of the Covid virus was highly virulent.

Public events reason behind Covid outbreak among fully vaccinated individuals in US: CDC study

Vaccine shots have reached several developing Asian countries like Pakistan, Nepal, Bhutan and Bangladesh. However, reaching India is taking time as there are some legal hurdles for emergency import.

Unable to send vaccines to India due to legal hurdles: US

These vaccines are the first to be authorized by the US Food and Drug Administration (FDA) for emergency use.

Explained: How Pfizer, Moderna generates lasting immunity

There is not adequate evidence to either confirm or reject the necessity for a booster dose after Covid vaccination, said World Health Organisation's chief scientist Soumya Swaminathan.

Explained: Is a Covid-19 vaccine booster dose required? WHO chief scientist answers

According to the health ministry, as many as 205,451,902 doses of the Covid vaccine have been administered in the country.

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