1. In India, all the four serotypes are found.
2. The reservoir of infection is both man and mosquito.
3. Adults usually have a milder disease than children.
4. Dengue hemorrhagic fever is caused by infection with more than one dengue virus.
Which of the statements given above is/are correct?
Dengue Virus Statements Analysis
This section analyzes the four statements regarding the dengue virus to determine which are correct.
Statement 1: Serotypes in India
Statement: "In India, all the four serotypes are found."
- The dengue virus exists in four main serotypes: DENV-1, DENV-2, DENV-3, and DENV-4.
- Epidemiological data confirms that all four serotypes are prevalent and circulate in India.
- Conclusion: Statement 1 is correct.
Statement 2: Reservoir of Infection
Statement: "The reservoir of infection is both man and mosquito."
- Dengue virus transmission occurs in a human-mosquito cycle.
- Humans are the primary reservoir for the virus.
- Mosquitoes (specifically species of Aedes, like Aedes aegypti) act as vectors, becoming infected by biting an infected person and then transmitting the virus to others.
- Considering the transmission cycle, both humans (as the source) and infected mosquitoes (as transmitters) are integral to maintaining the infection.
- Conclusion: Statement 2 is correct.
Statement 3: Disease Severity Comparison
Statement: "Adults usually have a milder disease than children."
- Dengue severity varies significantly among individuals, regardless of age.
- While children can experience severe dengue, adults are often reported to have a higher risk of developing severe forms of the disease, including Dengue Hemorrhagic Fever (DHF) and Dengue Shock Syndrome (DSS).
- Therefore, the statement that adults *usually* have milder disease is generally considered inaccurate.
- Conclusion: Statement 3 is incorrect.
Statement 4: Dengue Hemorrhagic Fever Cause
Statement: "Dengue hemorrhagic fever is caused by infection with more than one dengue virus."
- While a single dengue virus infection can cause classical dengue fever, severe manifestations like DHF are strongly associated with secondary infections.
- Secondary infection occurs when a person who has previously been infected with one dengue serotype is subsequently infected by a *different* serotype.
- This sequential infection increases the risk of developing severe dengue symptoms, including DHF.
- Conclusion: Statement 4 is correct.
Final Conclusion on Correct Statements
Based on the analysis, the correct statements are 1, 2, and 4.
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Incorrect
- Statement 4: Correct
Therefore, the combination of correct statements is 1, 2, and 4.
Important Questions from Disease
- The sequence of events leading to disability and handicap is:
- Which of the following are the characteristic features of screening tests?
1. Done on healthy people
2. Done on unhealthy people
3. More accurate
4. Less accurate
5. Less expensive
6. More expensive
7. Not a basis for treatment
8. Used as a base for treatment
Select the correct answer using the code given below: Match List-I with List-II and select the correct answer using the code given below the lists:
List-I (Major Group of Insecticides) List-II (Name of Insecticide) A. Stomach poison 1. Temephos B. Organo-chlorine compound 2. Propoxur C. Organo-phosphorous compound 3. Sodium fluoride D. Carbamates 4. Dieldrin - With reference to mumps, consider the following statements:
1. The average age of incidence of mumps is higher than that of measles and chicken pox.
2. The mumps disease tends to be more severe in adults than in children.
Which of the statements given above is/are correct? - Consider the following features of food poisoning:
'Incubation period less than 24 hours, source of infection is milk products, and symptoms include diarrhoea and vomiting.'
To which of the following does the above description apply?
1. Staphylococcal food poisoning
2. Salmonella food poisoning
3. Botulism
Select the correct answer using the code given below:
