#1
Which virus causes the flu?
Influenza virus
ExplanationInfluenza virus is the causative agent of the flu.
#2
Which of the following is NOT a symptom commonly associated with influenza?
Nausea and vomiting
ExplanationNausea and vomiting are not commonly associated symptoms of influenza.
#3
Which protein allows the influenza virus to enter host cells?
Hemagglutinin (HA)
ExplanationHemagglutinin (HA) is the protein that enables the influenza virus to enter host cells.
#4
Which influenza virus subtype caused the Hong Kong flu pandemic in 1968?
Influenza A (H3N2)
ExplanationThe Hong Kong flu pandemic in 1968 was caused by Influenza A subtype H3N2.
#5
Which of the following is NOT a common complication of influenza?
Meningitis
ExplanationMeningitis is not a common complication of influenza.
#6
What is the primary mode of transmission for influenza?
Airborne droplets
ExplanationInfluenza primarily spreads through airborne droplets.
#7
What are the subtypes of influenza viruses?
A, B, and C
ExplanationInfluenza viruses are classified into subtypes A, B, and C.
#8
What is the best way to prevent influenza?
Hand hygiene and vaccination
ExplanationPreventing influenza is best achieved through hand hygiene practices and vaccination.
#9
What is the incubation period of influenza?
3-5 days
ExplanationThe incubation period of influenza is typically 3-5 days.
#10
What is the role of neuraminidase (NA) in the influenza virus?
Causing the release of newly formed virus particles from infected cells
ExplanationNeuraminidase (NA) facilitates the release of newly formed virus particles from infected cells.
#11
Which animal is considered a natural reservoir for influenza A viruses?
Birds
ExplanationBirds are considered the natural reservoir for influenza A viruses.
#12
Which influenza subtype is responsible for the Spanish flu pandemic in 1918?
Influenza A (H1N1)
ExplanationThe Spanish flu pandemic in 1918 was caused by Influenza A subtype H1N1.
#13
What is antigenic drift in the context of influenza?
Gradual accumulation of mutations in surface proteins
ExplanationAntigenic drift refers to the gradual accumulation of mutations in surface proteins of the influenza virus.
#14
What is the main difference between influenza and the common cold?
Influenza has a sudden onset with more severe symptoms, while the common cold has a gradual onset with milder symptoms
ExplanationInfluenza usually has a sudden onset with severe symptoms, whereas the common cold has a gradual onset with milder symptoms.
#15
What is a cytokine storm in the context of severe influenza infection?
An exaggerated immune response leading to widespread inflammation
ExplanationA cytokine storm in severe influenza infection refers to an exaggerated immune response resulting in widespread inflammation.
#16
What is the mechanism of action of adamantanes, a class of antiviral drugs used against influenza?
Inhibiting viral entry by blocking M2 ion channel
ExplanationAdamantanes inhibit viral entry by blocking the M2 ion channel, thereby preventing influenza virus replication.
#17
What is a zoonotic infection?
An infection transmitted between different species
ExplanationA zoonotic infection is an infection that is transmitted between different species, such as from animals to humans.