Scorpions in China can be extremely venomous and funnily enough used in tradition Chinese medicine. The same with poisonous toads. Centipedes are also dangerous and they could kill a person on rare occasions. although, Mosquitoes are number 1 they can give you anything from Malaria to elephantiasis. Funnily enough only the female is a menace:

The females of most mosquito species suck blood (hematophagy) from other animals, which has made them the deadliest disease vector known, killing millions of people over thousands of years and continuing to kill millions per year by the spread of infectious diseases.

There are also three types of spider to be weary of:

The Chinese bird spider (Haplopelma schmidti) is a type of tarantula found in southern China and Vietnam and is considered extremely aggressive and highly venomous.

The golden earth tiger (Haplopelma huwenum) is closely related to the Chinese bird spider, but is found only in the southernmost regions, in Guangxi Province. The spider gets its name from the golden color of its abdomen. Although the golden earth tiger is not known to have caused any deaths among humans, its venom has been documented to cause swelling, joint stiffness and severe pain in the bite area.

The Chinese wolf spider (Lycosa singoriensis) is distributed widely throughout northwestern China, often in rice fields. The wolf spider is said to have the ability to run very fast, and unlike wolf spiders found in the United States, has a venom that can destroy red blood cells, inducing hemorrhaging in humans. Bites from the Chinese wolf spider can also cause severe infections and often times prokaryotic and eukaryotic cell damage, which in turn may cause slow healing and possibly skin deformities.

no bugs cant but human can.....!!!

the kind that bite

Easy answer... just make sure to kill and eat any bug before it has a chance to kill and eat you

never heard of any case like that