Common Diseases In Human Beings

Tsetse fly. Sleeping sickness is a parasitic disease and is found in the region of sub saharan Africa. The symptoms at the early stage are fever, joint pain, itching at the site of bite and headache. If left untreated it can go to the advanced stages that have the symptoms of disruption in sleeping pattern, neurological symptoms and even coma. The diagnosis of the disease can be done by blood sample that will indicate the presence of the parasite. It can be controlled by the tsetse fly population.

Sexual cycle. The causative agent of malaria is P.vivax. It has two phases: the sexual phase takes place in the female Anopheles mosquitoes and the asexual phase takes place in the RBC of the host. The mosquitoes inject sporozoites that will enter the bloodstream of humans. The sporozoites travel to the cells of the liver and multiply asexually. The cells then ruptures so that the merozoites are released into the bloodstream.

The correct answer is option (D): (b) and (c) only

• Common cold is caused by Rhinoviruses, linking A to III.
• Haemozoin is a byproduct formed by the parasite Plasmodium during malaria infection, linking B to I.
• The Widal test is used to diagnose Typhoid, linking C to II.
• Allergy reactions are commonly triggered by substances like Dust mites, linking D to IV.