Sickle cell aneamia is more common in South Africa. This is due to
Change in $\beta$-chain of haemoglobin
More population of house flies
Change in $\alpha$ -chain of haemoglobin
Change in $\gamma$ -chain of haemoglobin
An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as
Malaria is caused by
Cholera patient is administrated by ’saline drip' because
Organism responsible for filariasis
Humoral immunity is due to