Question 1

Which structural component of the influenza virus is responsible for binding to host cell receptors and facilitating viral entry?

Accepted Answer

Hemagglutinin (H) spike

Question 2

Influenza A viruses are classified into subtypes based on which two viral surface proteins?

Accepted Answer

Hemagglutinin (H) and Neuraminidase (N)

Question 3

Which of the following best describes antigenic drift in influenza viruses?

Accepted Answer

Minor mutations in the hemagglutinin and neuraminidase genes

Question 4

A patient presents with a sudden high fever, headache, muscle soreness, and fatigue. Which of the following is most likely if the symptoms last up to a month and are accompanied by a severe cough?

Accepted Answer

Influenza

Question 5

Which of the following is the primary mode of transmission for the influenza virus?

Accepted Answer

Aerosol droplets

Question 6

Why are secondary bacterial infections, such as pneumonia, common after influenza infection?

Accepted Answer

The virus destroys mucous and ciliated cells, impairing host defenses

Question 7

Which of the following statements about influenza B is correct?

Accepted Answer

It is found only in humans and causes limited epidemics

Question 8

A 35-year-old patient is diagnosed with influenza. Which diagnostic method is most likely to provide a rapid and accurate result within the first 48 hours of symptom onset?

Accepted Answer

Rapid antigen test from a nasal swab

Question 9

Which of the following best explains why annual influenza vaccination is recommended?

Accepted Answer

Antigenic drift leads to new viral strains that evade previous immunity

Question 10

During the 1918 'Spanish flu' pandemic, which age group experienced the highest mortality rate, as shown in epidemiological data?

Accepted Answer

Young adults (20-40 years)

Question 11

Which of the following best describes antigenic shift in influenza viruses?

Accepted Answer

Gene reassortment resulting in dramatic changes in H and N spikes

Question 12

A new influenza strain emerges after a pig is co-infected with avian and human influenza viruses. What is the most likely mechanism for this event?

Accepted Answer

Antigenic shift due to gene reassortment

Question 13

Which of the following is a key difference between the killed (injected) and live (nasal spray) influenza vaccines?

Accepted Answer

The live vaccine is not recommended for pregnant women

Question 14

Which of the following equations best represents the relationship between the number of pandemics and the interval between them for a given influenza subtype?

Accepted Answer

$$N = \frac{T}{I}$$, where $$N is $$the number of pandemics, $$T is $$total time, and $$I is $$the interval between pandemics

Question 15

Which of the following best explains why H5N1 avian influenza has not caused a human pandemic?

Accepted Answer

There is no evidence of person-to-person transmission

Question 16

A patient is exposed to influenza virus via aerosol droplets. Which part of the respiratory tract is initially invaded by the virus?

Accepted Answer

Upper respiratory tract (URT)

Question 17

Which of the following is a major host defense that is destroyed by influenza infection, increasing susceptibility to secondary infections?

Accepted Answer

Mucous and ciliated cells

Question 18

Which of the following best describes the reservoir for human influenza viruses?

Accepted Answer

Infected humans

Question 19

A 7-year-old child presents with fever, cough, and gastroenteritis during flu season. Which influenza type is most likely responsible for the gastrointestinal symptoms?

Accepted Answer

Influenza (any type, but more common in children)

Question 20

Which of the following is the most effective way to prevent influenza infection in a population?

Accepted Answer

Annual vaccination

Influenza Virus: Structure, Pathogenesis, and Clinical Features

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