(a) Amoebiasis – It is usually contracted by ingesting water or food contaminated by amoebic cysts. (b)Malaria – It is transmitted from one person to another by the female Anopheles mosquito. The mosquito picks up the parasite along with the blood when it bites an infected person. When this mosquito bites an other healthy person, the parasites migrate into his blood with the saliva, which the mosquito injects before sucking up blood to prevent its clotting. (c)Ascariasis – Transmitted through water, vegetables, fruits etc. contaminated with the eggs of the parasites. (d)Pneumonia – Spreads by cough & sneezes, by sharing drinking glass & eating utensils with an infected person.