NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Viruses replicate more rapidly over time.
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Viruses can mutate from year to year.
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Vaccines are absorbed in the body after a year.
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Vaccines get stronger over time.
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Detailed explanation-1: -The vaccine must be tweaked every year because influenza viruses are constantly changing and mutating. Multiple flu strains circulate in any given year, and the yearly vaccine aims to protect against three or four of the most likely strains.
Detailed explanation-2: -Influenza (flu) viruses are constantly changing. They can change in two different ways.
Detailed explanation-3: -It’s because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them. Located around the world are influenza surveillance centers that annually monitor the most common strains, collecting data and identifying new and evolving strains.
Detailed explanation-4: -Antigenic Drift As a virus replicates, its genes undergo random “copying errors” (i.e. genetic mutations). Over time, these genetic copying errors can, among other changes to the virus, lead to alterations in the virus’ surface proteins or antigens.