Disease Vectors and Pathogens

The Inland Taipan, also known as the Fierce Snake, is the most venomous snake in the world based on venom toxicity. Its venom is the most toxic of any snake, drop for drop. Russell's Viper, rattlesnakes, and Egyptian Cobras are highly venomous but less toxic than the Inland Taipan.

The Belcher's Sea Snake (Hydrophis belcheri) is widely regarded as the most poisonous snake, with venom estimated to be many times more potent than most terrestrial snakes including taipans and cobras.

Malaria is caused by Plasmodium parasites that infect and destroy red blood cells. The spleen works overtime to filter these damaged cells, often becoming enlarged (splenomegaly), making the spleen the organ most significantly affected by malaria.

Quinine is a traditional antimalarial medication extracted from the bark of the cinchona tree. It has been used for centuries to treat malaria by killing the Plasmodium parasites that cause the disease. AIDS is caused by HIV and requires antiretroviral therapy, while typhoid is a bacterial infection treated with antibiotics.

Malaria is a parasitic infection that primarily affects the spleen, causing splenomegaly (enlarged spleen). The Plasmodium parasite infects and destroys red blood cells. The spleen works overtime to filter these damaged cells, leading to its characteristic enlargement. The heart, lungs, and kidneys are not the primary target organs.

The Bhopal gas tragedy occurred at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal on the night of December 2-3, 1984. The disaster involved a methyl isocyanate gas leak that killed thousands of people. Union Carbide Corporation was the parent company.

Sleeping sickness (African trypanosomiasis) is transmitted by the tsetse fly, which is found only in rural Africa. The disease is caused by parasites of the Trypanosoma brucei species and can be fatal if untreated. Filariasis is transmitted by mosquitoes, smallpox is viral and spreads person-to-person, and anthrax is bacterial from infected animals or spores.

Filaria (filariasis) is a parasitic disease caused by nematode worms (Wuchereria bancrofti) transmitted through the bite of infected mosquitoes, primarily Culex, Anopheles, and Aedes species. The mosquitoes inject immature worms into the bloodstream, which mature and reproduce, causing lymphatic damage and elephantiasis. Option B correctly identifies the vector, not the pathogen itself.

Malaria primarily affects the spleen, which becomes enlarged (splenomegaly) as it works to filter out malaria-infected red blood cells. The parasite Plasmodium destroys red blood cells, and the spleen responds by increasing its filtering activity. While malaria can affect other organs systemically, the spleen bears the primary impact.

Typhoid and cholera are both caused by bacteria that spread through contaminated water and food. Typhoid is caused by Salmonella Typhi, while cholera is caused by Vibrio cholerae. Water-borne diseases are illnesses transmitted through infected water sources.

Malaria primarily affects the spleen, causing it to enlarge (splenomegaly) as it filters out infected red blood cells. The Plasmodium parasite infects and destroys red blood cells, which the spleen then removes. While malaria affects the whole body, the spleen bears the brunt of the damage.

Goitre is a thyroid enlargement caused by iodine deficiency, not a pathogen transmitted by mosquitoes. Dengue, Malaria, and Filariasis are all well-known mosquito-borne diseases caused by parasites or viruses spread through mosquito bites.

Elephantiasis (lymphatic filariasis) is caused by parasitic worms transmitted through the bite of infected mosquitoes, primarily Culex, Anopheles, and Aedes species. The worms block the lymphatic system, causing severe swelling and thickening of the skin and underlying tissues, typically in the legs and genital area.

Malaria is caused by Plasmodium parasites that infect and destroy red blood cells. The spleen works overtime to filter out these infected cells, leading to splenomegaly (enlarged spleen), which is a classic diagnostic feature of malaria.

Typhoid (Salmonella typhi) and cholera (Vibrio cholerae) are both transmitted through contaminated water and food. They are classic examples of water-borne diseases, not airborne infections.