by Tracy V. Wilson
Entomologists estimate that there are between 5 and 10 million species of insects on Earth. But if asked which insect they hate the most, many people would have no trouble choosing just one – the cockroach.
There are plenty of reasons to dislike cockroaches. Their flattened bodies, leathery wings, skittering legs and long, waving antennae give some people the creeps. Because roaches eat garbage and waste, they can spread bacteria like Salmonella and Shigella from place to place. As they walk, they leave trails of fecal matter which they use to find their way around. On top of being gross, these trails can cause stains and odors. The proteins in cockroach saliva and waste can also cause allergies and aggravate asthma.
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