Which of the following is an incorrect match between virus, genome and its mode of transmission?

Options

A. Hepatitis A virus — ss RNA — Fecal-oral route
B. Hepatitis B virus — ds RNA — Sexual contact
C. Polio virus — ss RNA — Fecal-oral route
D. Paramyxovirus — ss RNA — Saliva of infected person

Answer

To solve the question of identifying the incorrect match between a virus, its genome, and its mode of transmission, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the First Option: Hepatitis A Virus**
- **Genome**: Single-stranded RNA (ssRNA)
- **Mode of Transmission**: Fecal-oral route
- **Analysis**: This is a correct match. Hepatitis A is indeed transmitted through the fecal-oral route and has ssRNA as its genetic material.

2. **Identify the Second Option: Hepatitis B Virus**
- **Genome**: Double-stranded DNA (dsDNA)
- **Mode of Transmission**: Sexual contact
- **Analysis**: This is a correct match. Hepatitis B is transmitted through sexual contact and has dsDNA as its genetic material. However, the question mentions dsRNA, which is incorrect. This indicates a mismatch.

3. **Identify the Third Option: Poliovirus**
- **Genome**: Single-stranded RNA (ssRNA)
- **Mode of Transmission**: Fecal-oral route
- **Analysis**: This is a correct match. Poliovirus is transmitted through the fecal-oral route and has ssRNA as its genetic material.

4. **Identify the Fourth Option: Paramyxovirus**
- **Genome**: Single-stranded RNA (ssRNA)
- **Mode of Transmission**: Contact with saliva of an infected person
- **Analysis**: This is a correct match. Paramyxoviruses are transmitted through respiratory droplets (saliva) and have ssRNA as their genetic material.

### Conclusion:
The incorrect match is found in the **second option** regarding Hepatitis B virus, where it incorrectly states dsRNA instead of dsDNA.

### Final Answer:
The incorrect match is **Hepatitis B virus - dsRNA - Sexual contact**.

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