I already had Covid. Can I get Omicron? Your pandemic questions answered.

Some doctors say the CDC’s new guidance saying certain health care workers can isolate for 7 days while the rest of the public should still isolate for 10 days doesn’t make sense.

“I don’t understand why you’d have a different set of rules for health care workers than for other people,” former US Surgeon General Dr. Jerome Adams said.

The CDC said it issued emergency guidance for health care workers with Covid-19 due to concerns about the highly transmissible Omicron variant and potential staff shortages.

The agency said it “continues to evaluate isolation and quarantine recommendations for the broader population as we learn about the Omicron variant and will update the public as appropriate.”

Dr. Ashish Jha, dean of the Brown University School of Public Health, said he thinks fully vaccinated people who test positive for Covid-19 shouldn’t have to isolate for 10 days if they test negative in less than that time.

Jha said more studies need to be done to determine how long those people should isolate. He said a shorter, 5- to 7-day isolation window with a negative rapid test result might be helpful — and might encourage more people to get tested.

“Getting people back out of isolation is really critical to keeping things going,” Jha said. And a reduced isolation period for fully vaccinated people who later test negative creates an “incentive for people to get tested so they don’t have to be isolated for 10 days.”

There are certainly more risks if you’re not fully vaccinated.

Coronavirus often spreads more easily indoors rather than outdoors — especially if you’re indoors for an extended period of time.

Researchers have also found that heavy breathing and singing can propel aerosolized viral particles farther and increase the risk of transmission.

During one fitness instructor workshop, about 30 participants with no symptoms trained intensely for four hours, according to research published by the CDC. Eight participants later tested positive, and more than 100 new cases of coronavirus were traced back to that fitness workshop.

To help mitigate the risk, many gyms are limiting capacity or requiring masks.

And while health experts have recommended staying 6 feet away from others, it’s smart to keep even more distance than that at the gym.

“With all the heavy breathing, you may even want to double the usual 6 feet to 12 feet, just to be safe,” CNN Chief Medical Correspondent Dr. Sanjay Gupta said.

Unlike SARS and swine flu, the novel coronavirus is both highly contagious and especially deadly, CNN Chief Medical Correspondent Dr. Sanjay Gupta said.

“SARS was also a coronavirus, and it was a new virus at the time,” Gupta said. “In the end, we know that SARS ended up infecting 8,000 people around the world and causing around 800 deaths. So very high fatality rate, but it didn’t turn out to be very contagious.”

The swine flu, or H1N1, “was very contagious and infected some 60 million people in the United States alone within a year,” Gupta said. “But it was far less lethal than the flu even — like 1/3 as lethal as the flu.”

What makes the novel coronavirus different is that “this is both very contagious … and it appears to be far more lethal than the flu as well.”

Doctors say getting vaccinated is the best way to prevent coronavirus infection.

If you’re not vaccinated, it’s best to take the stairs if you can. But if you can’t, emergency room physician Dr. Leana Wen offers several tips:

• Wear a mask. Not only does wearing a mask reduce your risk of inhaling the virus — which can linger in the air for 8 minutes — it also helps reduce your chances of infecting others if you are an asymptomatic carrier.
• Use a tissue to push the elevator buttons. If you don’t have a tissue, use your elbow, then wash or disinfect that area when you can.
• Try to keep your distance from anyone else inside the elevator as much as possible.

For those not fully vaccinated, try to avoid public restrooms if you can, said microbiologist Ali Nouri, president of the Federation of American Scientists. But he acknowledged that’s not always possible: “Sometimes when you gotta go, you gotta go.”

Close contact with others is the most significant risk in a public restroom, Nouri said. So if there’s a single-person bathroom available that doesn’t have multiple stalls, using that might be best.

If you do use a multi-stall public restroom, Nouri offers the following tips:

• Don’t use your freshly washed hands to turn off the water with the germ-laden faucet handle. Instead, use a paper towel to turn off the water and open the bathroom door. Throw away the paper towel immediately afterward.
• Wear a face mask. “Masks are one of the most effective ways to stop human-to-human transmission,” Nouri said. “If people in a public bathroom are not wearing masks, think twice before going in.”
• If the restroom looks crowded, wait until it clears out, if you can. “You’re reducing the risk of inhaling aerosolized particles from other people,” Nouri said.

Any large gathering can increase the spread because this coronavirus is transmissible by talking or even just breathing. Carriers of the virus can be contagious even if they don’t have symptoms.

And when people are “shouting and cheering loudly, that does produce a lot of droplets and aerosolization that can spread the virus to people,” said Dr. James Phillips, a physician and assistant professor at George Washington University Hospital.

So doctors and officials say its important to get vaccinated or wear a face mask and try to keep your distance from others as much as possible.

“Viruses can live on surfaces and objects — including on money — although your chance of actually getting COVID-19 from cash is probably very low,” emergency medicine physician Dr. Leana Wen said.

The new coronavirus can live for up to 72 hours on stainless steel and plastic, up to 24 hours after landing on cardboard, and up to four hours after landing on copper, according to a study funded by the US National Institutes of Health.

So how do you protect yourself? To avoid touching cash or coins, use contactless methods of payment whenever possible, Wen said.

If you can’t use a contactless form of payment, credit cards and debit cards are much easier to clean and disinfect than cash. But remember that anyone who touches your credit card can also leave germs on it.

If you must use cash, “wash your hands well with soap and water” afterward, Wen said.

The same applies for anything else you touch that might have coronavirus on it. If you can’t wash your hands immediately, use hand sanitzier or disinfectant.

And since Covid-19 is a respiratory disease, make sure you avoid touching your face.

Coronavirus can stick to hair, said Dr. David Aronoff, director of the Division of Infectious Diseases at Vanderbilt University Medical Center.

Touching contaminated hair and then touching your mouth, eyes or nose could increase your risk of infection. “Like on the skin, this coronavirus is a transient hitchhiker that can be removed by washing,” Aronoff said.

But that doesn’t mean you have to wash the hair on your head multiple times a day, said dermatologist Dr. Hadley King.

That’s because “living hair attached to our scalps may be better protected by our natural oils that have some antimicrobial properties and may limit how well microbes can attach to the hair,” she said.

“If you are going out into areas that could possibly be contaminated with viral particles, then it would be reasonable to wash the hair daily during the pandemic. But it’s not the same as hand washing – the virus infects us through our mucosal surfaces. If your hair is not falling into your face or you’re not running your fingers through it, then there is less of a risk.”

If your hair does fall into your face, you may want to pull it back to minimize your risk, King said.

As for facial hair, “washing at least daily if not more frequently is wise, depending on how often they touch their face,” Aronoff said.