People who have had COVID-19 might need only one shot of a coronavirus vaccine
Their antibody levels were 500 times higher than in people vaccinated but never infected
![a person fills a needle with COVID-19 vaccine](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/03/030321_TI_covid-vax_feat.jpg?fit=1030%2C580&ssl=1)
Health care workers who had COVID-19 and then got a single dose of a two-dose coronavirus vaccine had higher antibody levels than those who hadn’t been infected, suggesting one shot might be enough for previously infected people.
Paul Christian Gordon/Alamy Stock Photo