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Entamoeba histolytica is a protozoan parasite in the large intestine of human which causes amoebiasis (amoebic dysentery). Streptococcus pneumoniae and Haemophilus influenzae are responsible for the disease pneumonia in humans which infects the alveoli (air filled sacs) of the lungs. Plasmodium, a tiny protozoan is responsible for malaria. Typhoid fever could be confirmed by Widal test. Wuchereria ( W . bancrofti and W. malayi), the filarial worms cause a slowly developing chronic inflammation of the organs in whic