Why are snails and insects similar?

snails and mosquitos can both play host to very nasty viral or parasitic passengers. snails can carry a parasite the causes schistosomiasis and different mosquitos can carry anything from dengue fever to yellow fever to malaria to west nile virus to philariasis.

schistosomiasis is very treatable if caught before late stages where as malaria, west nile, or dengue can cuase death very rapidly, some cases even 24 hours.