Pathogenic Micro Organisms a Text book of Microbiology for Physicians And Stude
Pathogenic Micro Organisms a Text book of Microbiology for Physicians And Stude
Ward J Macneal
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Micro-organisms exist in the air only as floating particles of dust, or as passengers on small drop- lets of moist spray, or as parasites on or in winged aerial creatures. Those floating as. Dust are derived from the earth's surface, and most of the living germs usually found in this condition are the spores of molds. Living tubercle bacilli are unquestionably suspended in the air as dust, especially in the dry sweeping of floors where careless consumptives have lived. The spores of anthrax bac...illi may also be suspended in the air where hides or wool of anthrax animals are handled. Other pathogenic bacteria may at times float as dust, but their presence in the air in this condition is apparently rather uncommon, and should be expected only in the fairly recent environment of cases of the disease. The moist droplets, expelled from the mouth and nose in speaking, in coughing and especially in sneezing, may remain suspended in the air for many minutes and be distributed to considerable distances.
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