Which of the following is correct statement?

Options

A. Mumps is a bacterial infection which causes swelling in parotid glands
B. Widal test is used for confirmation of infection by Salmonella typhi
C. Koch's disease is mainly caused by toxin tuberculin which is released by Yersinia pestis
D. Polio is caused by ds RNA virus which infect the CNS

Answer

To determine which of the following statements is correct, we will analyze each statement one by one.

1. **Statement 1**: "Mumps is a bacterial infection which causes swelling in the parotid gland."
- **Analysis**: This statement is incorrect. Mumps is caused by the mumps virus, which is a viral infection, not a bacterial one. It primarily affects the parotid glands, leading to their swelling.

2. **Statement 2**: "Vidal test is used for confirmation of infection by Salmonella typhi."
- **Analysis**: This statement is correct. The Vidal test, also known as the Widal test, is a serological test used to diagnose typhoid fever, which is caused by the bacteria Salmonella typhi.

3. **Statement 3**: "Coarse diseases mainly caused by toxin tuberculin which is released by Yersinia pestis."
- **Analysis**: This statement is incorrect. Coarse diseases refer to tuberculosis (TB), which is caused by the bacterium Mycobacterium tuberculosis. Yersinia pestis is the bacterium that causes plague, not tuberculosis.

4. **Statement 4**: "Polio virus is caused by double-stranded RNA virus which infects the CNS."
- **Analysis**: This statement is incorrect. Poliovirus is actually a single-stranded RNA virus, and it primarily affects the central nervous system (CNS).

Based on the analysis, the only correct statement is:

**Correct Answer**: Statement 2 - "Vidal test is used for confirmation of infection by Salmonella typhi."