MEDICINE
INFECTIOUS DISEASES
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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 by the body after a year.
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Vaccines get stronger over time.
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Detailed explanation-1: -Because new strains appear frequently, the seasonal flu vaccine usually changes each year, as scientists determine how the virus has mutated and spread.
Detailed explanation-2: -Antigenic drift is an important reason why people can get flu multiple times over the course of their lives. Antigenic drift is also a primary reason why the composition of flu vaccines for use in the Northern and Southern Hemispheres is reviewed annually and updated as needed to keep up with evolving flu viruses.
Detailed explanation-3: -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.
Detailed explanation-4: -The influenza virus changes (mutates) each year. So, getting vaccinated each year is important to make sure you have immunity to the strains most likely to cause an outbreak. MYTH: You can catch the flu from going out in cold weather without a coat, with wet hair or by sitting near a drafty window.
Detailed explanation-5: -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.