Q.41 Which of the following are viral diseases-
(A). Yellow fever
(B). Hepatitis B
(C). Chickenpox
(D). Rabies
1. (A), (B) and (D) only.
2. (A), (B) and (C) only.
3. (B), (C) and (D) only.
4. (A), (B), (C) and (D).
All four options—Yellow fever, Hepatitis B, Chickenpox, and Rabies—are viral diseases caused by distinct RNA or DNA viruses. The correct answer is option 4: (A), (B), (C), and (D).
Viral Disease Basics
Viral diseases result from virus infections targeting specific cells, often via respiratory, blood, or vector transmission.
Unlike bacteria, viruses require host replication, leading to symptoms like fever, rash, or organ damage; vaccines prevent many.
These examples highlight diverse viral families in human pathology.
Correct Answer: 4. (A), (B), (C) and (D)
All listed diseases are caused by viruses: no bacterial or other pathogens involved.
Yellow fever (Flaviviridae, mosquito-borne), Hepatitis B (Hepadnaviridae, bloodborne), Chickenpox (Herpesviridae, airborne), Rabies (Rhabdoviridae, bite-transmitted).
Option Breakdown
| Option | Diseases Included | Explanation | Correct? |
|---|---|---|---|
| 1 | (A), (B), (D) only | Excludes Chickenpox (viral); incomplete. | No |
| 2 | (A), (B), (C) only | Excludes Rabies (viral); misses one. | No |
| 3 | (B), (C), (D) only | Excludes Yellow fever (viral flavivirus); incomplete. | No |
| 4 | (A), (B), (C), (D) | All viral: flavivirus, hepadnavirus, herpesvirus, rhabdovirus. | Yes |
Pathogen Details
-
Yellow fever: RNA flavivirus; hemorrhagic fever via Aedes mosquitoes.
-
Hepatitis B: DNA hepadnavirus; chronic liver infection via blood/fluids.
-
Chickenpox: DNA varicella-zoster virus; vesicular rash, shingles later.
-
Rabies: RNA rhabdovirus; fatal encephalitis post-bite; post-exposure prophylaxis key.
Prevention Notes
Vaccines exist for Yellow fever, Hepatitis B, Chickenpox (varicella); Rabies uses immunoglobulin/vaccine post-exposure.
