Explanation:

Sandfly is a colloquial name for any species or genus of flying, biting, blood-sucking dipteran encountered in sandy areas.
Fleas- Small animals with large infestations can lose enough bodily fluid to fleas feeding that dehydration may result. Cat fleas also may be responsible for disease transmission through humans, and have been suspected as transmission agents of plague.
Malaria is caused by Plasmodium parasites. Plasmodium parasites infect people and attack the red blood cells, which often leads to severe illness and death. The parasites are spread to people through the bites of infected Anopheles mosquitoes, which are the malaria vectors and which bite mainly between dusk and dawn.