Voters have the right to vote, regardless of whether they are sick or in quarantine.
Voters who are sick or in quarantine should take steps to protect poll workers and other voters. This includes wearing a mask, staying at least 6 feet away from others, and washing your hands or using hand sanitizer before and after voting. You should also let poll workers know that you are sick or in quarantine when you arrive at the polling location. Check with local authorities for any additional guidance.

YESTERDAY, it said this. Updated Oct. 27, 2020
People who are sick can follow CDC advice for when to be around others.
When You Can be Around Others After You Had or Likely Had COVID-19
If you have or think you might have COVID-19, it is important to stay home and away from other people. Staying away from others helps stop the spread of COVID-19. If you have an emergency warning sign (including trouble breathing), get emergency medical care immediately.
I think or know I had COVID-19, and I had symptoms
You can be around others after:
10 days since symptoms first appeared and
24 hours with no fever without the use of fever-reducing medications and
Other symptoms of COVID-19 are improving
Loss of taste and smell may persist for weeks or months after recovery and need not delay the end of isolation​
Most people do not require testing to decide when they can be around others; however, if your healthcare provider recommends testing, they will let you know when you can resume being around others based on your test results.
Note that these recommendations do not apply to persons with severe COVID-19 or with severely weakened immune systems (immunocompromised). These persons should follow the guidance below for “I was severely ill with COVID-19 or have a severely weakened immune system (immunocompromised) due to a health condition or medication. When can I be around others?”
I tested positive for COVID-19 but had no symptoms
If you continue to have no symptoms, you can be with others after 10 days have passed since you had a positive viral test for COVID-19. Most people do not require testing to decide when they can be around others; however, if your healthcare provider recommends testing, they will let you know when you can resume being around others based on your test results.
If you develop symptoms after testing positive, follow the guidance above for “I think or know I had COVID-19, and I had symptoms.”
I was severely ill with COVID-19 or have a severely weakened immune system (immunocompromised) due to a health condition or medication. When can I be around others?
People who are severely ill with COVID-19 might need to stay home longer than 10 days and up to 20 days after symptoms first appeared. Persons who are severely immunocompromised may require testing to determine when they can be around others. Talk to your healthcare provider for more information. If testing is available in your community, it may be recommended by your healthcare provider. Your healthcare provider will let you know if you can resume being around other people based on the results of your testing.
Your doctor may work with an infectious disease expert or your local health department to determine whether testing will be necessary before you can be around others.

https://wattsupwiththat.com/2020/11/02/cdc-bails-on-coronavirus-rules-goes-all-in-with-democrats/