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Leading authorities on fleas claim that common cat fleas are potential killers. New research suggests that their ability to carry and transmit disease has been seriously underestimated, notes The Times of London. The rodent diseases of bubonic plague and murine typhus are believed to be passed on to humans by fleas from infected animals, claims Dr. Bernice Williams of the Medical Entomology Centre at Cambridge University. Also, contrary to the belief that an infested cat or dog is not significantly affected by the fleas, Williams indicates that numerous ills are caused by them. Until American scientists discovered the flea’s ability to absorb dangerous microorganisms, fleas were believed to be relatively harmless. This article is from jw.org website