Bacillus, pigment-producing bacteria and fungal spores are common in outdoor air; indoor air has more microorganisms than outdoor, especially in densely populated public places, hospital wards, outpatient clinics, etc., and is easily contaminated by carriers and patients. Common pathogens in indoor air include Neisseria meningitidis, Mycobacterium tuberculosis, Hemolytic cocci, Diphtheria bacilli, and Pertussis bacilli. Medicine | Education | Net collection and sorting of air bacteria health inspections sometimes use hemolytic streptococcus as an indicator bacteria, indicating that the air is polluted by microorganisms in human upper respiratory secretions.
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