The two diseases spread by mosquitoes are:

(i) Malaria: It is caused by two species of Plasmodium, Plasmodium falciparum or Plasmodium vivax and transmitted by female Anopheles mosquito. The symptoms for this disease include fevers, chills, sweating, headaches and other flu-like symptoms. If not treated, it can be fatal.

(ii) Dengue fever: It is a viral disease caused by dengue virus and transmitted by Aedes mosquito. The symptoms for this disease includes high fever, headaches, back and joint pain, rashes and eye pain.