The World Health Organization (WHO) has issued guidance saying children over the age of 12 should wear masks, in line with recommended practice for adults in their country or area.
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It admits little is known about how children transmit the virus but cites evidence that teenagers can infect others in the same way as adults.
The advice published on the WHO website covers three age groups.
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Children aged 12 and over should wear a mask under the same conditions as adults, in particular when they cannot guarantee a distance of at least one metre from others and there is widespread transmission in the area
For children aged between six and 11, the WHO advises taking into account how widespread the transmission of the virus is and whether the child is interacting with high-risk individuals such as the elderly. It also stresses the need for adult supervision to help children use, put on and take off masks safely.
Children aged five and under should not, under normal circumstances, wear masks.
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For teachers, the WHO said: “In areas where there is widespread transmission, all adults under the age of 60 and who are in general good health should wear fabric masks when they cannot guarantee at least a one-metre distance from others.
“This is particularly important for adults working with children who may have close contact with children and one another.”
Adults aged 60 or over, or those with underlying health conditions, should wear medical masks, it said.
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More than 800,000 people have now died with coronavirus worldwide.
At least 23 million cases of infection have been registered, according to Johns Hopkins University, with most of them recorded in the US, Brazil and India.
However, the true number of people who have had the virus is believed to be far higher, due to insufficient testing and asymptomatic cases.
The numbers have been rising again in countries as diverse as South Korea, EU states and Lebanon.
WHO chief Tedros Adhanom Ghebreyesus has said he hopes the pandemic will be over in two years but a top scientific adviser in the UK warned Covid-19 might never be eradicated, with people needing regular vaccinations.