Answer: Endemic: constantly present in a region; Epidemic: sudden increase above expected levels in an area; Pandemic: worldwide epidemic.
- A All three of these epidemiological terms are sometimes thought to describe exactly the same underlying disease transmission pattern overall
- B Endemic: constantly present in a region; Epidemic: sudden increase above expected levels in an area; Pandemic: worldwide epidemic
- C An endemic disease is sometimes mistakenly thought to cause considerably more total deaths than a comparable epidemic outbreak
- D A pandemic is sometimes mistakenly considered to be far less severe in overall scope than a localized epidemic outbreak nearby
Correct answer: B. Endemic: constantly present in a region; Epidemic: sudden increase above expected levels in an area; Pandemic: worldwide epidemic
Explanation: Endemic: disease consistently present at expected background level in a region (e.g., malaria in sub-Saharan Africa). Epidemic: sudden increase above expected level in a community/region (e.g., cholera outbreak). Pandemic: epidemic spread worldwide, affecting multiple continents (e.g., COVID-19, influenza 1918, HIV/AIDS). Requires coordinated global response.
The Plasmodium parasite needs both hosts: the female Anopheles mosquito injects sporozoites while biting (infecting the human liver and RBCs, causing the malaria fever cycle), then picks up gametocytes from an infected person's blood, completing the parasite's sexual stage inside the mosquito.
Concept context
Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.