How long does it take for the flu vaccine to become effective?

See Facts About Seasonal Flu Vaccine.

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1. What time is Navajo County Health Department open?
2. What services does Navajo County Public Health provide?
3. How do vaccines work?
4. How long does it take for the flu vaccine to become effective?
5. Where can I get help to quit my tobacco addiction?
6. Where can I get information about WIC? Or breastfeeding?
7. How to I obtain a copy of my birth certificate?