The Mosquito is a highly infectious Gurgler type due to its flying capabilities. Another thing that makes it so dangerous is that they are silent until filled.

The way of infection through this specific class is that they land on any nearby gurgler type and proceed to suck up mold virus from them and transfer it onto a random female or a female A-Sync member.

However, this class does have a limit to how much they can carry inside their bodies (as seen in the photo telegraphed above)