SYDNEY, Nov 29 (Reuters) - Asian markets regained a little composure on Monday as investors settled in for a few weeks of uncertainty on whether the Omicron variant would really derail economic recoveries and the tightening plans of some central banks.

Britain called an urgent meeting of G7 health ministers on Monday to discuss developments on the virus, although a South African doctor who had treated cases said symptoms of Omicron were so far mild.

"There is a lot we don't know about Omicron, but markets have been forced to reassess the global growth outlook until we know more," said Rodrigo Catril, a market strategist at NAB.

"Pfizer expects to know within two weeks if Omicron is resistant to its current vaccine, others suggest it may take several weeks.

dollar, to the benefit of the safe haven Japanese yen and Swiss franc.

Early Monday the dollar had steadied somewhat at 113.81 yen , after sliding 1.7% on Friday.

European Central Bank President Christine Lagarde put a brave face on the latest virus scare, saying the euro zone was better equipped to face the economic impact of a new wave of COVID-19 infections or the Omicron variant.