Question:
Carrier state is not important in the transmission of which of the following diseases?
Carrier state is not important in the transmission of which of the following diseases?
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Which listed disease has no chronic or sub-clinical carrier and spreads only from acute cases?
Updated On: Jun 24, 2026
- Measles
- Typhoid
- Polio
- Diphtheria
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: A carrier is a person who harbours and excretes a pathogen without showing clinical disease, and so acts as a hidden source of infection in the community.
Step 2: Carriers are epidemiologically important only for diseases where the organism can persist in or on the host after recovery or without illness. Typhoid has chronic faecal/gallbladder carriers, diphtheria has nasopharyngeal carriers, and polio is spread largely by inapparent (sub-clinical) infections that act as carriers.
Step 3: Measles is an acute viral infection with no carrier state. Transmission occurs only from acute clinical cases via respiratory droplets during the catarrhal and early rash period; once recovered the person clears the virus completely and is not infectious.
Step 4: Therefore the carrier state plays no role in measles transmission, making it the exception. The correct answer is option 1 (Measles).
Step 2: Carriers are epidemiologically important only for diseases where the organism can persist in or on the host after recovery or without illness. Typhoid has chronic faecal/gallbladder carriers, diphtheria has nasopharyngeal carriers, and polio is spread largely by inapparent (sub-clinical) infections that act as carriers.
Step 3: Measles is an acute viral infection with no carrier state. Transmission occurs only from acute clinical cases via respiratory droplets during the catarrhal and early rash period; once recovered the person clears the virus completely and is not infectious.
Step 4: Therefore the carrier state plays no role in measles transmission, making it the exception. The correct answer is option 1 (Measles).
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