For example, Cattle Egrets (Bulbulcus ibis) forage commensally
with ungulates (Grubb 1976), Great Egrets (Ardea alba) with black-tailed deer (Odocoileus hemionus) (Herring and Herring 2007), and Fan-tailed Warblers (Euthlypis lachrymosa) with nine-banded armadillos (Dasypus novemcinctus) (Komar and Hanks 2002).
25) They are found commensally
in the body flora, where they cause chronic sinusitis, chronic recurrent tonsillitis, bronchitis, pneumonia, chronic otitis media, parotitis, intra-abdominal infection, genitourinary infection, and wound infections in immune-suppressed individuals as well as when in conjunction with facultative anaerobic bacteria (ie, Streptococcus pyogenes, Staphylococcus aureus, Haemophilus influenzae, Klebsiella pneumonia, Proteus mirabilis, and Escherichia coli).
With the lining of the mouth constantly under attack by a barrage of bacteria that commensally
lives and grows in the mouth, the lining of the oral cavity has put up an innate and formidable defense line of peptides called human beta defensins 2 and 3 (hBD2 and hBD3) that may prevent humans from getting sick and may promote rapid healing from food abrasions or accidental bites to the tongue and mouth.
Streptococci of the anginosus group can reside commensally
in the human oral cavity but have a certain propensity to cause pharyngitis, bacteremia, and serious purulent infections in the deep neck and soft tissue and in internal organs such as the brain, lung, and liver (17-25).