SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A person’s antibodies level never declines after receiving the vaccine
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People only have passive immunity to the flu for one year
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The flu virus evolves quickly
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The flu virus remains unchanged from year to year
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Detailed explanation-1: -Why do I need to get vaccinated every year? Because flu viruses change so quickly, last year’s vaccine may not protect you from this year’s viruses.
Detailed explanation-2: -Why is it important to get a flu vaccine EVERY year? Flu viruses are constantly changing, so flu vaccines may be updated from one season to the next to protect against the viruses that research suggests will be common during the upcoming flu season.
Detailed explanation-3: -One way flu viruses change is called “antigenic drift.” Drift consists of small changes (or mutations) in the genes of influenza viruses that can lead to changes in the surface proteins of the virus, HA (hemagglutinin) and NA (neuraminidase).
Detailed explanation-4: -Seasonal flu vaccines are designed to protect against infection and illness caused by the flu viruses that research indicates will be most common during the upcoming flu season. Flu vaccines do not protect against infection and illness caused by other viruses that also can cause flu-like symptoms.
Detailed explanation-5: -The influenza virus rapidly accumulates mutations and easily “reassorts, ” or swaps, genes between strains, creating variants that can dodge any past immunity people had acquired naturally or from vaccines. That’s why a new flu vaccine must be developed each year.