Nasopharyngeal (NP) Swabs And Throat Swab For Viral Respiratory Infections There will be all kinds of bacteria parasitic in the mouth, because we breathe and eat through the mouth. Such as cacon, a variety of staphylococci, various Streptococcus, diphtheria-like bacteria, Klebsiella pneumoniae and E. coli and so on. There are also anaerobic bacteria, such as digestive bacteria, Bacteroides and yeasts. You …