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Top Stories. But you know, if you want to test at two days, but that negative test You might want to test again and of course symptoms you cannot ignore - scratchy throat, headaches, all kinds of symptoms - anything new can be a symptom of this new illness. First things first, those who believe they have been in contact with someone who has COVID and are unvaccinated should quarantine.
Those who test positive, regardless of vaccination status, must isolate, according to the Centers for Disease Control and Prevention. Those who have been within six feet of someone with COVID for a cumulative total of at least 15 minutes over a hour period should quarantine for five days if unvaccinated, or if they are more than six months out from their second vaccine dose, according to updated CDC guidance issued Monday. Previously, the CDC said people who were not fully vaccinated and who came in close contact with an infected person should stay home for at least 10 days.
Those who are both fully vaccinated and boosted do not need to quarantine if they are a close contact of someone with COVID, but should wear a mask for at least 10 days after exposure. The same goes for those who are fully vaccinated and not yet eligible for their booster shot. Local health authorities can also make the final determination about how long a quarantine should last, however, and testing can play a role. In Chicago, those who travel to or from certain parts of the country and are unvaccinated must quarantine upon arrival to the city, but the length of time they should do so for depends on whether they get tested for COVID.
As of Tuesday, the city's travel advisory recommends those who travel from designated warning states should:. At the end of the period, if you have no symptoms, you can return to normal activities but must wear a mask everywhere — even at home around others — for at least five more days. If you still have symptoms after isolating for five days, stay home until you feel better and then start your five days of wearing a mask at all times.
But colds are also extremely contagious. The Centers for Disease Control and Prevention CDC says they can be spread through the air, close contact with infected people, and even through an infected person's fecal matter say, if they don't properly was their hands after using the bathroom.
You can take all the necessary steps to protect yourself—washing your hands with soap and water, avoiding touching your face, and staying away from sick people—but chances are, you'll still cross paths with a cold virus and come down with something.
But even in that case, you can still take steps to protect someone else from the fate that befell you—and that has a lot to do with knowing how long cold viruses last and how contagious they are.
First, the basics: MedlinePlus says the incubation period of a cold—or the amount of time between when you're infected and when you begin to show symptoms—is about two or three days. Unfortunately, it's during that time when you may be most contagious, Jazmine Sutton, MD, a hospital medicine specialist at Cleveland Clinic, tells Health. Those symptoms Dr. Sutton is referring to are just typical cold symptoms: sore throat , runny nose, coughing, sneezing, headaches, and body aches.
Once those cold symptoms show up, they can last anywhere from a few days to up to two weeks, per MedlinePlus—and in the majority of cases, a cold is most often not contagious after the first week.
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