There are four types of COVID-19 vaccines: here’s how they work
There are four types of COVID-19 vaccines: here’s how they work
1 week ago
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If you have already had COVID-19, do you still need both doses of the vaccine? Do these vaccines protect you against infection? Do they protect us against variants? World Health Organisation's Dr Katherine O'Brien answers these questions in "Science In 5" this week. [Credit: World Health Organization (WHO)] | NDTV
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