After studies of the stability of the "QVED-19" virus over time, on different surfaces, including tissues, woods and fabrics, researchers revealed that "a noticeable amount of the infectious virus can remain on the outer layer of the surgical muzzle for up to seven days," according to the paper that They published it in the "Lancet" journal, and it remained on copper for four hours, on cardboard 24 hours, and on plastic for three days.

In a report by the Observatory of the Future, affiliated with the Dubai Future Foundation, that the pandemic led to a decrease in the masks, especially surgical, and N95 masks, to the extent that officials came out calling for special hand-made masks and leaving medical masks for doctors on the front lines, citing a lack of evidence Scientific evidence on the effectiveness of the masks in the prevention, unless worn by someone already infected.

But these calls ignore the fact that many of the injured people do not show symptoms, at least at the beginning, so they may have transmitted the disease without knowing if they went out without a muzzle, and therefore the Centers for Disease Control and Prevention advised to cover faces in public places, and the scholars are unanimously agreed that it is necessary to stay in homes except for a need, And the need for social separation at exit, to flatten the pandemic curve. The researchers also noted the necessity of wearing the masks and removing them in a correct way. The researcher, Malik Peres, said: “It is very important not to touch the outer surface of the muzzle, otherwise your hand may be contaminated with the virus, and it will infect you if you touch your face.” The Centers for Disease Control and American prophylaxis were advised to wash hands immediately after taking off. It is worth noting that researchers found the virus more stable on smooth surfaces, and it was found before you that it remained on copper for four hours, on cardboard 24 hours, and on plastic for three days, although it was also affected by other factors such as temperature and humidity.