Question

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dimitri received a flu vaccination earlier in the year. however, he has just been tested and has a confirmed case of the flu. why did dimitri most likely get the flu? vaccinations are not always effective. vaccinations are not effective if hygiene is poor. vaccinations give individuals the flu with full symptoms. vaccinations work only when provided at the onset of the disease.

Explanation:

Vaccinations stimulate the immune - system to recognize and fight pathogens, but they are not 100% effective. There are various factors that can lead to their failure such as the mutation of the virus, individual immune - system variability, etc.

Answer:

Vaccinations are not always effective.