How does the transmission of each of the following diseases take place? (a) Amoebiasis (b) Malaria (c) Ascariasis (d) Pneumonia
a) Amoebiasis: By ingesting quadrinucleated cysts of Entamoeba histolytica with food and water. The cysts are carried from the faeces of the patient to food and water. (b) Malaria: Plasmodium (malarial parasite) is transmitted from the patient to a healthy person when bitten by a female Anopheles mosquito. (c) Ascariasis: The disease is transmitted by ingesting contaminated food and water with embryonated eggs of Ascaris. (d) Pneumonia: It is a bacterial disease which is transmitted by the sputum and droplets released during coughing of the patient.
