In what year did scientists discover that insects carried disease? Who discovered it?

Question

-I don't mean a particular insect, just the fact that they can carry disease.

Answer 1

The specific case you're probably after is the transmission of yellow fever by mosquitos in the Panama. Mosquitos were first suggested to be the biological vector by Carlos Finlay; this was later supported through expermentation by Walter Reed and friends.

Answer 2

Triatominae

At the beginning of the 19th century Charles Darwin made one of the first to report the existence of triatomines in America in his Journal and Remarks, commonly known as The Voyage of the Beagle. The following is an extract of what he wrote on 25 March 1835:
At night I experienced an attack (for it deserves no less a name) of the Benchuca, a species of Reduvius, the great black bug of the Pampas. It is most disgusting to feel soft wingless insects, about an inch long, crawling over one's body. Before sucking they are quite thin, but afterwards they become round and bloated with blood, and in this state are easily crushed.
The members of Triatominae (trī·ə′täm·ə′nē), a subfamily of Reduviidae, are also known as conenose bugs, kissing bugs or triatomines.

Answer 3

what year did the first man walk on earth then you will find your answer

Answer 4

Oh god; "that insect"........Which insect are you referring to?