Researchers around the world are racing to develop a vaccine against Covid-19, with more than 140 candidate vaccines now tracked by the World Health Organization (WHO).

Vaccines normally require years of testing and additional time to produce at scale, but scientists are hoping to develop a coronavirus vaccine within 12 to 18 months.

Vaccines mimic the virus – or part of the virus – they protect against, stimulating the immune system to develop antibodies. They must follow higher safety standards than other drugs because they are given to millions of healthy people.

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