Researchers say they might have a lead on a possible COVID-19 vaccine

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Healthy volunteers taking part in a clinical trial of an experimental COVID-19 vaccine have been injected with the first of four vaccine candidates from Pfizer and a German partner.

The volunteers were recruited from New York University and the University of Maryland.

Researchers have tried to identify the components of COVID-19 most noticed by the human immune system and then to teach the immune system what microbes to attack when the virus invades the body.

The experimental vaccines are based on a form of genetic material called R-N-A which has never been approved to prevent an infectious disease.

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