The reason I asked about Virus's and air filter goes all the way back to Legionnaires Disease.
https://en.wikipedia.org/wiki/Legionnaires%27_disease
It is usually spread by breathing in mist that contains the bacteria.[4] It can also occur when contaminated water is aspirated.[4] It typically does not spread directly between people, and most people who are exposed do not become infected.[4] Risk factors for infection include older age, a history of smoking, chronic lung disease, and poor immune function.[5][10] Those with severe pneumonia and those with pneumonia and a recent travel history should be tested for the disease.[11] Diagnosis is by a urinary antigen test and sputum culture.[6]
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