It's not that they carry diseases, though that's not great for species that get those diseases, it's that this particular species of mosquito (Aedes aegypti) is

It's not that they carry diseases, though that's not great for species that get those diseases, it's that this particular species of mosquito (Aedes aegypti) is really just a pest we bring with us. They aren't native to most places and pretty much follow us around and prey on us, piggy backing on the most invasive species of all.