A gas mask to protect against the virus in the air (in the case of biological warfare), but it must be coupled with a number of different things, such as hazmat suits.
Mask is different from the common virus in terms of size – they usually offer full coverage, in the sense that they are protecting someone's face completely. If you are looking for gas masks then you can explore https://www.gasmaskpro.com/.
Gas masks virus is one of the most expensive. This gas mask was specially designed for personnel using optical sighting devices. This gas mask is intended to protect the eyes, face, and respiratory system against chemical agents.
One of the worst things about the virus and gas masks hazmat suits is that you are still infected with the removal of pieces of protection by getting viruses and bacteria from their surface.
This is why people go through a neutralizing bath with hazmat suits in hundreds of films.
If you are ever in a situation that ensures protection against viruses – God forbid – do not remove their gas masks and hazmat suits unless they have been cleaned with a solution that has proven to neutralize all the bacteria and viruses that strength posed a threat to your health.