How the Johnson & Johnson single-dose COVID-19 vaccine is different from others

The United States now has a third regulator-approved coronavirus vaccine.

The US Food and Drug Administration (USFDA) cleared the vaccine produced by medical giant Johnson & Johnson.

However, this vaccine is different from the others approved in the US.

It has provided optimism that swathes of the world could be vaccinated from COVID-19 much quicker than first thought.

Johnson & Johnson have a vaccine that requires a single-dose

Johnson & Johnson have achieved something different to most other vaccine candidates — they have developed a single-dose COVID-19 vaccine.