Influenza Quiz

1. If you have the flu, how long are you contagious?

• 48 hours after symptoms appear
• 1 week after symptoms appear
• 1 day before symptoms appear and for 5-7 days after
• 2 days before symptoms appear and for 48 hours after

2. What causes seasonal influenza?

• Haemophilus influenzae
• Influenza virus A or B
• Parainfluenza virus
• Rhinovirus

3. The influenza virus is constantly changing. What are the main mechanism(s) that cause these changes? Select all that apply.

• Transformation
• Antigenic shift
• Antigenic drift
• Conjugation

4. Which other viruses present symptoms similar to influenza and circulate at the same time. Select all that apply:

• Rhinovirus
• Respiratory syncytial virus
• Legionella sp.
• Strep throat

5. In 2009, the H1N1 strain of influenza caused a global pandemic resulting in many serious illnesses and deaths.  What type of change in the influenza virus happened in 2009 that made the seasonal influenza vaccine ineffective?

• Antigenic shift
• Antigenic drift
• Vertical gene transfer
• Transformation

6. Which antigenic type(s) of influenza virus can affect humans?

• A & B
• A, B, and C
• A, B, C and D
• H1N1

7. What is not a common symptom of an influenza viral infection?

• Body aches
• Sore throat
• Vomiting
• Fever

8. According to the CDC, how should rapid influenza diagnostic tests (RIDTs) be confirmed to minimize false results?

• Viral tissue cell culture
• No recommendation, RIDT is specific enough
• Immunofluorescence, Direct (DFA) or Indirect (IFA)
• Sending respiratory samples for RT-PCR confirmation

9. When is the peak influenza season?

• October through late January
• January through early April
• December through February
• September through December

10. Which influenza type is named based on the subtypes of its surface antigens H (hemagglutinin) and N (neuramindase)?

• Type B
• Type C
• Type A & B
• Type A