Although the aCovid-19 virus is hosted by bats, some particular subtype might affect other mammals too, including humans. In a direct manner the virus is contacted from infected birds, mostly household poultry but sometimes wild birds also can infect hunters, tribal people, etc. Within an indirect manner the infection can enter the human system via edibles infected with the virus, polluted water, objects, air, food, etc. by the bodily secretions or excretions of infected birds. The flu virus being airborne, the contamination within the air might be reasonably high, in cases of epidemic or pandemic proportions. Infected people carry the flu virus with them wherever they travel and spread it in air and on objects they touch via their nasal secretions and bodily discharges.
Personal Protective Equipment or PPE as they are called are equipments designed for health professionals to use should they be doing work in contaminated environments. Nose and mouth respirators or ‘Masks’ are the types most widely used. Bird flu masks are very specific pertaining to the truth that the bird flu virus is microscopic and it is not easily filtered out from the environment using conventional filters.
These masks are designed on the guidelines provided by National Institute for Occupational Safety and Health (NIOSH). Based upon filtering efficiency, the filters found in the Facial Mask fall under 3 categories, namely Type 95, Type 99 and kind 100. The proportions of microscopic (.3 micron wide) particles filtered out by these filters are 95%, 99% and 99.7%, respectively. Even the filters are categorized based on filter efficiency degradation and therefore are hence defined as, N (non-resistant to oil), R (oil resistant) and P (oil proof). Every person mask is tested in laboratory settings before being approved on the market. But N95 ones are disposable and should not be cleaned.
The most typical ones are N-95 filtering respirators which have been approved by NIOSH (also known as as Filtering Facepieces) to be effective drastically cutting down exposure risks to airborne viruses like SARS or Avian Influenza. The usage of masks is usually recommended to individuals doing work in high contamination situations, like healthcare workers attending to patients, or field workers involved in destroying the infection sources, etc.
Another set of extremely effective, protective masks are Powered Air-Purifying Respirators (PAPRs). They are more efficient than N-95 masks in offering better protection. They are employed by persons who cannot wear N-95 masks, like individuals with facial hair. This battery operated mask features a face piece with breathing tube and filters.
Even though any mask is not a guarantee against influenza infection, they dramatically cut down the probability of infection from airborne viruses. It remains to get said however, that the capabilities from the masks degrade over time quprnl usage. Aerosols, if contained in the working environments, degrade filters even more. Hence, Facial Mask should not be combined with 100% reliance, only as among the preventive tool. Much more, you will find guidelines that should be adhered to while (re)using such PPE. It is actually hence clear that the best defense does not lie in any quantity of measures taken but rather within the knowledge that they are implemented.