DETROIT – Michigan Gov. Gretchen Whitmer’s stay-at-home order shutters many businesses amid a coronavirus (COVID-19) outbreak.

The order prohibits all businesses and operations from requiring workers to leave their homes, unless those workers are necessary to sustain or protect life or to conduct minimum basic operations.

While the order doesn’t name marijuana businesses, according to the Marijuana Regulatory Agency, both medical and recreational marijuana businesses can remain open.

RELATED: Nonessential businesses continue to remain open despite Michigan’s stay-at-home order

These businesses are only allowed to conduct curbside service or delivery. No sales are allowed inside the stores.

The stores must also comply with social distancing rules by maintaining distance between workers and having the minimum number of employees needed working.

MORE: What the CDC says you should do if you believe you have coronavirus (COVID-19)

Person-to-person spread

The virus is thought to spread mainly from person-to-person.

• Between people who are in close contact with one another (within about 6 feet).
• Through respiratory droplets produced when an infected person coughs or sneezes.

These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs.

Can someone spread the virus without being sick?

• Spread is possible before people show symptoms. People who are not showing symptoms can still be carrying the virus and can still pass it on to other people.

Spread from contact with contaminated surfaces or objects

It may be possible that a person can get COVID-19 by touching a surface or object that has the virus on it and then touching their own mouth, nose, or possibly their eyes, but this is not thought to be the main way the virus spreads.

How easily the virus spreads

How easily a virus spreads from person-to-person can vary. Some viruses are highly contagious (spread easily), like measles, while other viruses do not spread as easily. Another factor is whether the spread is sustained, spreading continually without stopping.

There is currently no vaccine to prevent coronavirus disease 2019 (COVID-19). The best way to prevent illness is to avoid being exposed to this virus. However, as a reminder, CDC always recommends everyday preventive actions to help prevent the spread of respiratory diseases, including:

• Avoid close contact with people who are sick.
• Avoid touching your eyes, nose, and mouth.
• Stay home when you are sick.
• Cover your cough or sneeze with a tissue, then throw the tissue in the trash.
• Clean and disinfect frequently touched objects and surfaces using a regular household cleaning spray or wipe.

Wash your hands often with soap and water for at least 20 seconds, especially after going to the bathroom; before eating; and after blowing your nose, coughing, or sneezing.

Click here for more guidelines from the CDC.

People who think they may have been exposed to COVID-19 should contact their healthcare provider immediately.

Question about coronavirus? Ask Dr. McGeorge here.