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* Oil, banks lead sectoral declines
* Shell to write down value of oil and gas assets again
* Frankfurt shares of BioNtech jump 1.7% (Updates to close)
Dec 21 (Reuters) - European shares fell on Monday in their worst session in almost two months as the rapid spread of a new strain of the coronavirus forced more stringent curbs in Britain and travel bans from several countries.
Broad-based losses pushed the pan-European STOXX 600 index down 2.3%, its lowest close since mid-November, after the UK imposed an effective lockdown and reversed plans to ease curbs over Christmas as the new strain is up to 70% more transmissible than the original.
A long list of countries from around the world closed their borders to Britain, with European neighbour France’s ban also including freight carriers.
A plunge in the pound limited losses in London’s FTSE to 1.7%, while main indexes in Germany, France , Spain and Italy all dived close to 3%. Spain’s IBEX posted its worst day in six-months.
“Markets are reeling from the latest twist in the coronavirus crisis which has clouded the outlook for the remainder of 2020 and much of the first quarter of 2021,” said AJ Bell investment director Russ Mould.
“Restrictions on traffic between the UK and other countries, including in the case of France on freight, has raised the pressure on a supply chain already creaking under the weight of an online Christmas and Brexit uncertainty.”
Travel and leisure stocks had their worst day in three months, with British Airways owner IAG, Trainline and travel company TUI down between 1% and 10.5%. Cruise operator Carnival Corp shed 5.6%.
As crude oil prices slid, energy companies BP , Total and Royal Dutch Shell lost almost 5%, leading losses in Europe.
Shell was further weighed down by a $3.5 billion to $4.5 billion writedown in the value of oil and gas assets.
Banks lost 3.6% - their worst day since September, as risk aversion sent investors fleeing to the safety of bonds.
Uncertainty over Brexit trade deal negotiations added to pressure on the market. With less than two weeks before Britain leaves the European Union’s orbit, neither side has budged far enough for a breakthrough.
Worries about the new virus strain also reduced the impact of an agreement on a $900 billion fiscal aid package in the United States that will be voted on Monday.
Vaccines should still be effective against the new strain, scientists said. Britain has already rolled out the Pfizer-BioNtech vaccine, while the European Medicines Agency approved the vaccine on Monday. A European Commission nod is expected later in the day for a European roll-out.
Frankfurt shares of BioNtech rose 1.7%.
Among the few gainers were healthcare and consumer stocks such as Reckitt Benckiser and grocery retailer Ocado . (Additional reporting by Supriya R in Bengaluru; editing by Uttaresh.V/Sriraj Kalluvila/Jane Merriman)