What if a second dose is not available within the suggested time frame? Will it affect the efficacy of the vaccine?

The Texas Department of State Health Services (DSHS) plan allows for providers to receive second doses for anyone they have vaccinated with a first dose. Efficacy of just one dose is unknown at this time, and it is recommended that you receive your second dose as close after the 21st day (for the Pfizer vaccine) or 28th day (for the Moderna vaccine). It is not recommended to receive your second dose sooner. 

Medical experts are now saying that your second shot can come as late as 6 weeks after the first shot and still give protection, but advise that the shorter timeframes shown above are optimal.  

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1. What phases can currently receive the COVID-19 vaccine?
2. Where can I be vaccinated if I am eligible under the current Phases 1A or 1B?
3. Where can I find a list of vaccine providers?
4. What are important things I should know after being vaccinated?
5. Can I get a vaccine anywhere, in any county or state?
6. Are there differences between the vaccines? If so, what are they?
7. Are these vaccines effective against the new “variant virus” now spreading throughout the country?
8. Are there any side effects to the vaccine? How long do they last?
9. How long does it take for the vaccine to be in full effect?
10. Do you have any protection from the first dose?
11. Once I have received the vaccine, do I still need to wear a mask, wash hands and continue social distancing?
12. After receiving the first dose of vaccine, can I go to a different provider for the second dose?
13. How will I know when to take the second dose of the vaccine?
14. What if a second dose is not available within the suggested time frame? Will it affect the efficacy of the vaccine?
15. Will the vaccine cost anything?
16. What allergies should I be concerned about in connection with the COVID-19 vaccine?
17. Should I still get the vaccine if I already had COVID?