Contagious airborne pathogens for humans represent particles smaller than one micron, they are difficult to remove, penetrate deeply into the airways and make up 99% of the total number of particles in the air.

Most of the microorganisms involved in the transmission of nosocomial diseases by air require certain proximity between source and recipient, but there are many others, such as the pathogens of tuberculosis and diphtheria, flu virus or bacterial and fungal spores, which have a greater resistance or tend to mobilize through dust thus reaching large transmission distances.

In hospitals and medical centers it is important to consider that there is a high population of immuno-compromised patients very susceptible to infection.

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