Infectious Diseases Practice Questions

Q: Which of the following are key strategies for managing acute vector-borne infections?

All of the options. ***All of the options*** - **Regular insecticide spraying** is a crucial vector control measure that reduces the population of disease-carrying insects, thereby decreasing transmission rates. - **Daily surveillance** of cases helps in early detection, monitoring disease trends, and implementing timely public health interventions to control outbreaks. - **Presumptive treatment of fever cases** in endemic areas allows for rapid intervention, reducing disease severity, preventing complications, and limiting further transmission, especially when diagnostic tests are not immediately available. *Regular insecticide spraying* - This intervention targets the **vector population** directly, aiming to reduce their numbers and interrupt the disease transmission cycle. - It is effective in controlling outbreaks and preventing widespread disease, particularly for diseases like **malaria** and **dengue**. *Daily surveillance* - Involves continuous monitoring of disease incidence, which helps in identifying new cases quickly and tracking the spread of the infection. - **Early detection** through surveillance is essential for deploying rapid response teams and implementing containment strategies effectively. *Presumptive treatment of fever cases* - This strategy involves administering anti-malarial or other appropriate treatments to individuals presenting with fever in endemic regions, even without laboratory confirmation. - It is critical in situations where rapid diagnostic facilities are limited, ensuring that patients receive timely treatment and reducing the **morbidity** and **mortality** associated with vector-borne infections.

Q: Following are larval control measures, except:

DDT. ***DDT*** - **DDT (dichlorodiphenyltrichloroethane)** is primarily classified as an **adulticide** in vector control programs, used mainly for **indoor residual spraying** to kill adult mosquitoes. - While DDT can kill larvae when applied to water, it is **not typically categorized as a larval control measure** in public health practice due to environmental concerns and its primary use against adult vectors. - Its mechanism involves interfering with the **nervous system** of insects, causing paralysis and death. *Paris green* - **Paris green** is a chemical compound historically used as a **larvicide**, particularly effective against **Anopheles larvae** in stagnant water. - It works as a **stomach poison** for larvae when ingested during feeding, making it a specific larval control agent. *Gambusia* - **Gambusia**, also known as **mosquitofish**, are small fish that feed on mosquito larvae, making them a **biological control measure** for larval populations. - They are often introduced into ponds, ditches, and other water bodies to naturally reduce larval numbers. *Intermittent irrigation* - **Intermittent irrigation** is an **environmental manipulation method** that involves draining and refilling water sources at regular intervals, effectively destroying **larval breeding sites**. - This method prevents larvae from completing their development cycle by eliminating the aquatic environment they depend on.

Q: In the context of AIDS control programs, which sexually transmitted infection is specifically treated with the blue-colored pack?

Genital ulcers. ***Genital ulcers*** - The "blue-colored pack" in AIDS control programs is specifically designed for the syndromic management of **genital ulcer disease (GUD)**. - Treating GUD is crucial for AIDS control strategies because genital ulcers facilitate **HIV transmission** by breaking the mucosal barrier. *Urethral discharge* - Urethral discharge is typically managed with the **green-colored pack**, which targets pathogens commonly causing urethritis. - This symptom primarily indicates **gonorrhea** or **chlamydia**, which are distinct from genital ulcers in their syndromic management. *Scrotal swelling* - Scrotal swelling is managed with the **white-colored pack**, which focuses on conditions like **epididymitis** or **orchitis**. - This syndromic approach addresses infections causing inflammation of the testes and epididymis, which are different from GUD. *Ano-rectal discharge* - Ano-rectal discharge is generally addressed with the **green-colored pack**, similar to urethral discharge, targeting pathogens like **gonorrhea** and **chlamydia**. - While anogenital infections can manifest in various ways, discharge from the anorectal area is managed differently from genital ulcers.

Q: Which of the following statements about the DOTS treatment for tuberculosis is correct?

Case finding 70%, cure rate 85%. ***Case finding 70%, cure rate 85%*** - The **DOTS strategy** set a global target of detecting at least **70% of new sputum smear-positive TB cases** and curing at least **85% of these cases**. - Achieving these targets was considered crucial for controlling the spread of **tuberculosis** at a population level. *Case finding 80%, cure rate 85%* - While a **cure rate of 85%** is a key target of the DOTS strategy, the **case finding target was not 80%**. - Setting a higher case finding target might be desirable, but the **established goal** for DOTS was slightly lower to be more achievable. *Case finding 80%, cure rate 80%* - Neither the **case finding target nor the cure rate target** for DOTS was 80%. - The **cure rate target** was specifically emphasized as being higher to ensure effective treatment outcomes and prevent drug resistance. *Case finding 70%, cure rate 75%* - While **case finding 70%** aligns with the DOTS target, the **cure rate target was higher than 75%**. - A lower cure rate would indicate less effective treatment management, potentially leading to **treatment failures** and the emergence of **multidrug-resistant TB**.

Q: Which of the following countries has never reported any indigenous cases of rabies?

New Zealand. ***New Zealand*** - **New Zealand** has strict **biosecurity measures** and is one of the few countries globally to have **never recorded any indigenous case of rabies**, making it a **rabies-free country**. - The absence of rabies is maintained through rigorous **quarantine regulations** for imported animals and a lack of indigenous host species for the virus. *United Kingdom* - The **United Kingdom** has experienced sporadic cases of **rabies**, primarily in **bats** (bat lyssavirus), although it has been officially declared free from **terrestrial rabies** since 1992. - Imported cases in animals or humans have occurred, making it distinct from countries that have never had any rabies cases. *Japan* - **Japan** successfully **eliminated rabies** in 1957 through extensive vaccination programs and strict animal control measures. - While it is currently considered **rabies-free**, Japan **had endemic rabies historically** before elimination, unlike New Zealand which never had the disease. *Iceland* - **Iceland** is also considered **rabies-free** with no recorded indigenous cases, similar to New Zealand, largely due to its **geographic isolation** and **strict animal import regulations**. - However, **New Zealand** is the most commonly cited example of a rabies-free nation in medical literature due to its size and comprehensive biosecurity program.

Q: Which of the following statements about Kyasanur Forest Disease is false?

Man to man transmission is seen. ***Man to man transmission is seen*** - Kyasanur Forest Disease is primarily an **enzootic cycle** involving monkeys, rodents, and ticks; there is **no evidence of direct person-to-person transmission**. - While humans can become infected, they are considered **dead-end hosts** and do not typically transmit the virus to other humans. *Caused by Flavivirus* - **Kyasanur Forest Disease virus (KFDV)** is indeed an **RNA virus** belonging to the genus Flavivirus and the family Flaviviridae. - This classification is accurate and important for understanding its biological characteristics. *Transmitted by bite of infective ticks* - The primary vector for KFDV transmission to humans and animals is the **hard tick, Haemaphysalis spinigera**, which becomes infected after feeding on infected monkeys or other small mammals. - **Tick bites** are the main mode of transmission; direct contact with infected animals can also lead to infection. *Incubation period of 3 to 8 days* - The typical incubation period for Kyasanur Forest Disease in humans is indeed **3 to 8 days** after exposure to the virus, though it can range from 3 to 10 days. - This relatively short incubation period leads to rapid onset of symptoms once infected.

Q: Which of the following is not caused by Aedes aegypti?

Japanese encephalitis. ***Japanese encephalitis*** - **Japanese encephalitis virus** is transmitted primarily by mosquitoes of the genus *Culex*, particularly ***Culex tritaeniorhynchus*** - ***Aedes aegypti* does NOT transmit Japanese encephalitis** - this is the key distinguishing feature - *Culex* mosquitoes breed in rice paddies and other stagnant water bodies, maintaining the transmission cycle between pigs, birds, and humans *Yellow fever* - *Aedes aegypti* is the primary vector for yellow fever virus in urban transmission cycles - Also transmits yellow fever in sylvatic (jungle) cycles in endemic areas of Africa and South America *Dengue* - *Aedes aegypti* is the principal vector for all four serotypes of dengue virus worldwide - Highly adapted to urban environments, breeding in artificial water containers - Responsible for the global dengue pandemic affecting tropical and subtropical regions *Filaria* - While *Aedes aegypti* is not a major vector for lymphatic filariasis, it can occasionally be involved in transmission in certain regions - The primary vectors for filariasis are ***Culex quinquefasciatus*** (urban areas), *Anopheles* species (rural areas), and *Mansonia* species - *Wuchereria bancrofti* and *Brugia malayi* are the main filarial parasites causing lymphatic filariasis

Q: Which Millennium Development Goal specifically addresses HIV/AIDS?

Goal 6: Combat HIV/AIDS, malaria and other diseases. ***Goal 6: Combat HIV/AIDS, malaria and other diseases*** - This Millennium Development Goal (MDG) directly focused on reducing the spread of **HIV/AIDS**, malaria, and other major diseases as a key global health priority. - It included targets such as halting and beginning to reverse the incidence of HIV/AIDS, and achieving universal access to treatment for HIV/AIDS for all who need it. *Goal 1: Eradicate extreme poverty and hunger* - This goal addressed fundamental socioeconomic issues like **poverty** and **food insecurity**, which are broad determinants of health but not specific to HIV/AIDS. - While poverty can exacerbate the impact of HIV/AIDS, this MDG did not directly target the disease itself. *Goal 3: Promote gender equality and empower women* - This MDG focused on improving the status of women and girls, recognizing that **gender inequality** can be a risk factor for HIV transmission. - However, it did not directly address the combatting of HIV/AIDS as its primary objective. *Goal 8: Develop a global partnership for development* - This goal focused on improving international cooperation for development, including access to affordable **essential medicines**, which could include antiretrovirals for HIV/AIDS. - While it supported efforts to combat HIV/AIDS through partnerships, it was not solely dedicated to this health challenge.

Q: Which of the following diseases does not have healthy carriers?

Measles. ***Measles*** - Measles is a highly contagious viral disease that typically presents with a characteristic **rash**, **fever**, **cough**, **coryza**, and **conjunctivitis**. - Individuals infected with measles are usually symptomatic and contagious during the **prodromal phase** and until several days after the rash appears; asymptomatic carriage is generally not observed. *Diphtheria* - Healthy carriers of **Corynebacterium diphtheriae** can exist, particularly in the pharynx or skin, without showing overt disease symptoms. - These carriers can still **transmit the bacteria** to susceptible individuals, making them a public health concern. *Salmonellosis* - Individuals infected with **Salmonella Typhi** (which causes typhoid fever) can become asymptomatic chronic carriers, shedding bacteria in their stool for years. - While other Salmonella species can cause acute gastroenteritis, chronic asymptomatic carriage is most notable with **typhoid fever**. *Poliomyelitis* - Many individuals infected with the **poliovirus** can be asymptomatic and shed the virus in their stool. - These healthy carriers play a significant role in the **transmission of the virus** within communities, making eradication challenging.

Q: According to DOTS-PLUS guidelines 2013, which of the following statements about the treatment of multidrug-resistant TB is incorrect?

Continuation phase - 2 drugs. ***Continuation phase - 2 drugs*** - According to DOTS-PLUS guidelines (2013), the continuation phase for multidrug-resistant TB (MDR-TB) should include at least **three to four effective drugs**, not two. - Using only two drugs in the continuation phase would be grossly inadequate and would likely lead to treatment failure and the development of extensively drug-resistant TB (XDR-TB). - This statement is **clearly incorrect** and represents a major deviation from standard treatment protocols. *Total duration 24-27 months* - According to DOTS-PLUS 2013 guidelines, the total treatment duration for MDR-TB is typically **18-24 months** (at least 18 months after culture conversion). - In complex cases, treatment may be extended beyond 24 months, though 24-27 months falls within acceptable parameters for difficult cases. - This statement is essentially correct for the upper range of treatment duration. *Intensive phase 6-9 months* - The intensive phase for MDR-TB treatment is indeed typically **6-9 months** or until culture conversion is documented. - This phase includes daily injectable agents and multiple oral drugs to rapidly reduce bacterial load. - This statement is **correct**. *Intensive phase - 6 drugs* - The 2013 DOTS-PLUS guidelines recommend an intensive phase regimen comprising **at least 4 effective drugs including an injectable agent**. - A 5-6 drug regimen may be used in complex cases or when drug susceptibility is uncertain. - While not the minimum standard, using 6 drugs is within acceptable practice, making this statement **generally correct**.

Question 1

Which of the following are key strategies for managing acute vector-borne infections?

Accepted Answer

All of the options

Answer

Presumptive treatment of fever cases

Answer

Regular insecticide spraying

Answer

Daily surveillance

Question 2

Following are larval control measures, except:

Accepted Answer

DDT

Answer

Gambusia

Answer

Intermittent irrigation

Answer

Paris green

Question 3

In the context of AIDS control programs, which sexually transmitted infection is specifically treated with the blue-colored pack?

Accepted Answer

Genital ulcers

Answer

Urethral discharge

Answer

Scrotal swelling

Answer

Ano-rectal discharge

Question 4

Which of the following statements about the DOTS treatment for tuberculosis is correct?

Accepted Answer

Case finding 70%, cure rate 85%

Answer

Case finding 80%, cure rate 85%

Answer

Case finding 80%, cure rate 80%

Answer

Case finding 70%, cure rate 75%

Question 5

Which of the following countries has never reported any indigenous cases of rabies?

Accepted Answer

New Zealand

Answer

United Kingdom

Answer

Japan

Answer

Iceland

Question 6

Which of the following statements about Kyasanur Forest Disease is false?

Accepted Answer

Man to man transmission is seen

Answer

Transmitted by bite of infective ticks

Answer

Incubation period of 3 to 8 days

Answer

Caused by Flavivirus

Question 7

Which of the following is not caused by Aedes aegypti?

Accepted Answer

Japanese encephalitis

Answer

Yellow fever

Answer

Dengue

Answer

Filaria

Question 8

Which Millennium Development Goal specifically addresses HIV/AIDS?

Accepted Answer

Goal 6: Combat HIV/AIDS, malaria and other diseases

Answer

Goal 1: Eradicate extreme poverty and hunger

Answer

Goal 3: Promote gender equality and empower women

Answer

Goal 8: Develop a global partnership for development

Question 9

Which of the following diseases does not have healthy carriers?

Accepted Answer

Measles

Answer

Diphtheria

Answer

Salmonellosis

Answer

Poliomyelitis

Question 10

According to DOTS-PLUS guidelines 2013, which of the following statements about the treatment of multidrug-resistant TB is incorrect?

Accepted Answer

Continuation phase - 2 drugs

Answer

Total duration 24-27 months

Answer

Intensive phase 6-9 months

Answer

Intensive phase - 6 drugs

Infectious Diseases — MCQs

Infectious Diseases — MCQs

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