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Bites and stings: Clinical
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Bites and stings can be caused by a variety of animals, insects, snakes or yes, even humans!
The most common mammalian bites are from dogs, cats, and humans. And each bite transmits the polymicrobial flora that can be found in the mouth - including Staphylococcus aureus, group A Streptococcus species, Klebsiella, Enterococci, Prevotella and many more.
Dog bites can transmit a gram negative rod called Capnocytophaga canimorsus, which can cause gangrene at the bite site and can disseminate and cause sepsis, especially in asplenic individuals and those with liver disease.
Finally, human bites can transmit Eikenella corrodens which is a gram negative anaerobe which can cause local and disseminated infection - including being a cause of culture-negative endocarditis - one of the HACEK organisms.
Dog bites are the most common ones of all, and because dogs have strong jaws they often cause serious tissue injury, but infections aren’t that common.
In contrast, cats have long, thin teeth, that create deep puncture wounds, which very often get infected. Cat bites can even reach the underlying joint space or periosteum, leading to septic arthritis or osteomyelitis.
Like cat bites, human bites also have a high risk of infection.
Most human bites happen due to aggressive play between children, but can also happen among adults.
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