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Munich (dpa / lby) - The virologist Alexander Kekulé considers the obligation to wear FFP2 masks in public transport and retail to make sense in principle.

"Of course, an FFP2 mask is much safer than a mouth and nose mask, which is often worn very loosely," said the professor at the University of Halle-Wittenberg of the German press agency.

In Bavaria, such masks are compulsory in all shops, buses, underground and suburban trains from Monday.

Other federal states are considering whether to follow suit.

Lots of people crowded into a tight space, especially on public transport, said Kekulé.

With an FFP2 mask, the risk of infection decreases significantly.

"But it also makes sense in many a small bakery shop, especially because it is sometimes not possible to ventilate properly there."

Risk patients should always wear an FFP2 mask in closed rooms with several people.

However, he has concerns as to whether such masks will meet with acceptance by all citizens.

"Many have lovingly sewn fabric masks or bought expensive and are suddenly supposed to switch to FFP2 masks," said the virologist.

He also feared a rush to pharmacies and shops that sell the masks.

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FFP2 masks can only protect against infection with the coronavirus if they are tight.

“Cheap masks often don't close properly on the nose,” said Kekulé.

The bracket over the nose must be pressed firmly with both hands so that air can only escape through the mask.

“As soon as the FFP2 mask is just a little damp, it has to be changed immediately.

That is even more important than with a simple mouth and nose protection ”, emphasized Kekulé.

For example, if you stand in line in front of a shop in the rain or snow, you may have to change your mask immediately before entering the shop.

The masks in public space are currently not the main problem.

The number of cases is still so high because there are still massive outbreaks in old people's and nursing homes, said the virologist.

At home, infected people are usually not isolated and infect the entire household.

He also advocates stricter rules in the workplace, such as an obligation to wear mouth and nose protection.

"There are also more and more people who don't follow the rules because they no longer understand them," said Kekulé.

"In order to take these people with them, politicians must justify their measures in a comprehensible manner."