Face masks are compulsory on public transport in Portugal, as seen here on the Metro in Lisbon. Europe is expecting an autumn wave of coronavirus infections. There are concerns about the spread of a new omicron covid variant, , also known as Centaurus. Anna Watson/Alamy

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Keywords: , centaurus, compulsory, cornavirus, covid, covid-19, face, health, lisbon, mascaras, masks, measures, metro, obligatory, pandemic, portugal, public, safety, transmissible, transmission, transport, variant