[Campbell Biology P.459] According to the text, which of the following statements correctly ... | Practice Question

According to the text, which of the following statements correctly distinguishes between different types of influenza viruses and the concept of "emerging viruses"?

  • A: Influenza types B and C readily cause global epidemics in humans, while type A is primarily found in animals.
  • B: All influenza A strains are considered emerging viruses due to their wide host range and high mutation rates.
  • C: Normal seasonal flu viruses are not considered emerging viruses because their variations generally do not lead to new widespread outbreaks.
  • D: The H5N1 strain has caused a global pandemic because of its high mortality rate and easy person-to-person transmission.

Explanation

The text differentiates between emerging viruses and seasonal flu. It states that normal seasonal flu viruses are not considered emerging because their variations do not typically lead to new widespread outbreaks, unlike novel strains that can cause pandemics. It also clarifies that influenza B and C have not caused epidemics, and H5N1 has not caused a global pandemic due to limited person-to-person transmission.