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I know the cockroaches are creepy for humans. But I want to know why humans are afraid of cockroaches and what will be the effect of there bite on my body. Can I touch them or if they walk over my foot is safe for me!
Are they toxic like snake or scorpion?
How they bite us?
What will be the effect if more than one cockroaches bite me?
Do I still get any disease if they don't bite me but present in my house?
There is already a question related to cockroaches bite on this form but it's about cockroaches lay eggs or not while biting and it doesn't explain the possible effects of the bite.
I have reared cockroaches by the thousands, for years. Three species, but mainly the infamous Periplaneta americana which I am sure everyone has at least heard about (see picture at the end).
First of all: Cockroaches do bite, and they have powerful mandibles. This is in the paper below:
Many people think they won't bite because they have never handled cockroaches. In fact, cockroaches are amongst the most common insects scavenging dead bodies, and they'll pester sleeping individuals when they're starving (e.g. in crowded infested buildings or ships).
In the case of large P. americana, males are way more prone to biting than females, especially when they're flying around. I have been bit three times by these cockroaches, and it hurts. Once I was wearing latex gloves and seized a large male, and it bit me through the glove. Because of the pinch, I pulled it off with my other hand, and the glove teared open. Last time, I was bit about 1.5 year ago on the shoulder in my sleep by an adult female P. australasiae. The pinch was enough to wake me up (so I could kill the bloody roach) and left a red mark that lasted for 2 days.
There are numerous reports of cockroach bites going infected, specially around lips. Linked paper is referenced as: http://dx.doi.org/10.1590/S1413-86702006000100006
Finally, they're not poisonous neither venomous insects, as they produce no relevant toxins. However they may carry many pathogenic microbes, so laster effects from contact with cockroaches may develop.
Hope this was clear enough!
Millions of people live with cockroaches and there are nearly zero cases of hospitalization, thousands of times more people are admitted for wasp/spider stings, putting marbles in their nose, knife injuries etc. They may cause damage to food, like rodents, without any serious illnesses unlike rodents.
Here is the only roach attack hospitalization that I can find, versus thousands of bee and wasp incidents, a normal and sober person would sneeze and wake up. Apparently she did not suffer a bite: https://newsinfo.inquirer.net/868535/doctors-remove-live-cockroach-from-indian-womans-skull