A parasitic wasp larva that lives off the body of the cockroach it invades secretes substances with potent antimicrobial properties, according to German biologist Gudrun Herzner and her colleagues. A number of antimicrobial substances have been identified in animals, but they haven't yet proven useful in human medicine because it's difficult to obtain the compounds in large quantities and some are toxic. However, scientists are examining potential pathways to new antibiotics that may help combat antibiotic-resistant infections.

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