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    my text books says that most respiratory infections are caused by gram positive bacteria, because there mode of transmission is air. what makes gram positive bacteria able to be transmitted in air and why cant gram negative bacteria or viruses be transmitted through air?
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    (Original post by ScreamYourHeartOut)
    my text books says that most respiratory infections are caused by gram positive bacteria, because there mode of transmission is air. what makes gram positive bacteria able to be transmitted in air and why cant gram negative bacteria or viruses be transmitted through air?
    Gram +ves have only a peptidoglycan cell wall as opposed to a second membrane (with lipopolysaccharides), as in Gram -ves. This makes them less susceptible to drying out and so they can live on dry surfaces (and, apparently, in dry air). Staphylococci will live even better in aerobic conditions than some other Gram +ves (e.g. Streptococci) because they have catalase, which breaks down H2O2, a toxic molecule produced in aerobic environments.
 
 
 
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