Question

How do scientists choose which flu strain should be used for the flu vaccine each year?a) The same vaccine is used every yearb) The vaccine is choosen randomly from a selection of four differenr strains c) The strain for the next year's vaccine is done by total random selection d) The vaccine is choosen by observing history and the current strain then a prediction is made for what will occur the next year

Answer 1

Vaccine

Vaccines are essential to prevent diseases such as the flu. Therefore, the flu vaccine should be administered annually to the population.

It is necessary to remember that the virus that causes the flu undergoes many mutations, therefore, it is not efficient to apply the same vaccine every year.

The selection of which flu strain should be used for the manufacture of vaccines has some characteristics, such as:

• Which strain of the flu virus is causing the most illness during the season;

,

• Which is spreading the most before the season even starts;

,

• How effective is the previous vaccine for the strains that are most circulating.

Therefore, we can conclude that scientists choose the strain that will be used in the next year according to many criteria. So option "D" is correct.