Surgical masks are usually used by healthcare personnel and those infected or suspected of being infected. Their use is intended to prevent people who have a viral load from transmitting it when they expire, either by coughing, speaking, sneezing, etc. They are, therefore, highly effective against EFB bacterial filtration. Depending on their EFB, there are two types: I and II (the latter has a higher level of filtration and is usually resistant to blood splashes).
Their sale is exclusive to pharmacies and their use should not exceed 4 hours and they should be replaced if they are wet, dirty or torn.
It is important to look at the expiration date, so that its use is effective.