France's health authority is recommending that anyone previously infected with Covid-19 should only receive one vaccine jab, instead of the normal two doses.
People who recover from Covid have some immunity and should be inoculated three-six months afterwards, it said.France is the first country to issue this advice.
It has delivered nearly 2.8 million vaccinations so far, the health ministry said.
"The single vaccine dose will thus play the role of a booster" for someone previously infected with coronavirus, the Haute Autorité de Santé (HAS) said.
The recommendation comes as governments around the world are rushing to vaccinate their populations and try to return life to normal.