Which of the following is a challenge in developing an annual influenza vaccine?

Question

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All of the listed options are significant challenges in the development of an annual influenza vaccine. Influenza viruses evolve rapidly, necessitating constant monitoring and prediction of which strains will be most prevalent each season. The development process, which takes about six months, adds to the complexity, as it requires early decision-making about which strains to include in the vaccine. Additionally, the existence of many influenza strains complicates the selection of strains to target each year.

Which of the Following Is a Challenge in Developing an Annual