Several European countries have introduced restrictive measures due to a new increase in COVID-19 infections. The new coronavirus variant Omicron was detected in South Africa on Friday and has spread rapidly across Europe.

"There is an obvious concern about the economic recovery [of the euro zone] in 2022, but I believe we have learnt a lot. We now know our enemy and what measures to take. We are all better equipped to respond to a risk of a fifth wave or the Omicron variant", Lagarde told Italian broadcaster RAI on Sunday.

"The crisis taught us this virus knows no boundaries. Therefore we will not be protected until we are all vaccinated", Lagarde was quoted as saying in a simultaneous Italian translation from French.

(Reporting by Gianluca Semeraro; editing by Alexander Smith)