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

A patient presents with sudden onset of high fever, headache, muscle soreness, and fatigue. Which of the following is the most likely diagnosis based on these symptoms and the provided table?

Accepted Answer

Influenza

Question 3

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

Accepted Answer

Minor mutations in hemagglutinin and neuraminidase spikes leading to new yearly strains

Question 4

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

Accepted Answer

The influenza virus destroys mucous and ciliated cells in the lower respiratory tract, compromising host defenses.

Question 5

Which of the following statements about influenza A is correct?

Accepted Answer

It is named based on the types of hemagglutinin (H) and neuraminidase (N) spikes it possesses.

Question 6

A 35-year-old patient is diagnosed with influenza. Which of the following is the most effective way to reduce the severity of symptoms if administered within 48 hours of onset?

Accepted Answer

Antiviral drugs

Question 7

Which of the following best explains why influenza vaccines must be updated annually?

Accepted Answer

Antigenic drift causes minor changes in viral surface proteins, leading to new strains each year.

Question 8

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

Accepted Answer

Young adults (20-40 years)

Question 9

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

Accepted Answer

Aerosol droplets from coughing or sneezing

Question 10

A new influenza strain emerges after a pig is infected with both avian and human influenza viruses, resulting in gene reassortment. What is this process called?

Accepted Answer

Antigenic shift

Question 11

Which of the following best describes the genetic material of the influenza virus?

Accepted Answer

Single-stranded RNA

Question 12

Why is the nasal swab preferred over the throat swab for influenza diagnosis?

Accepted Answer

There is more virus present in the nasal cavity than in the throat.

Question 13

Which of the following is a key difference between influenza and the common cold, according to the provided table?

Accepted Answer

Influenza is associated with a sudden, high fever, while the common cold rarely causes fever.

Question 14

Which of the following best explains why influenza pandemics can occur?

Accepted Answer

Antigenic shift creates new viral subtypes to which the population has little or no immunity.

Question 15

Which of the following is true regarding the H5N1 avian influenza virus?

Accepted Answer

It mainly infects birds and only occasionally infects humans, with no sustained person-to-person spread.

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 (nasal cavity, pharynx, larynx)

Question 17

Which of the following best describes the function of neuraminidase (N) spikes on the influenza virus?

Accepted Answer

They help release new viral particles from infected cells.

Question 18

Which of the following is a recommended prevention strategy for influenza?

Accepted Answer

Receiving a killed virus vaccine by injection

Question 19

Which of the following best explains why the live attenuated influenza vaccine (nasal spray) was NOT recommended for the 2016-17 and 2017-18 flu seasons?

Accepted Answer

It was found to be ineffective during those seasons.

Question 20

A 7-year-old child presents with fever, cough, and runny nose. The symptoms last for two weeks, and the child develops bronchitis. Which of the following is the most likely complication of influenza in children?

Accepted Answer

Bronchitis and secondary bacterial infections

Influenza Virus: Structure, Pathogenesis, and Epidemiology

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