I know Mosquito’s carry malaria but I was wondering if other insects can communicate other fatal diseases, particularly Rabies.
Yellow fever, encephalitis, and West Nile by the mosquito; sleeping sickness by the tsetse fly; rocky mountain spotted fever and lyme disease by a tick (though I don’t believe those last two are fatal).
Rabies, no. AIDS, no (there was some concern about that in the early days, but it’s not a transmission vector). The diseases that can be transmitted by insects have germs that have evolved that way. Malaria and yellow fever, for instance, go through a life cycle that moves them from the insects stomach to the glands that produce their anticoagulant.
If a mosquito bit something with rabies, the rabies virus would remain in its stomach. A few might be passed along to another person if they were bit immediately afterwards, but the amount would be too small to spread.