Just as people can track dirt into a home on unclean shoes, “houseflies may carry on their feet millions of microorganisms that, in large enough doses, can cause disease, ” says the Encyclopædia Britannica.
ऐसे दो खास तरीके हैं जिनसे कीड़े, इंसानों में बीमारी फैलाते हैं ।