They\u2019ll be hit with a few or all<\/a> of the following symptoms: chills, fever, cough, sore throat, body aches, fatigue and headaches, and runny or congested nose.<\/p>\n Once you get flu symptoms, \u201cpeople are most contagious the first few days of it,\u201d Millen said, and remain contagious for up to seven days<\/a>.<\/p>\n Stay home while you are symptomatic. Once symptoms start improving overall and the fever has left without the use of fever-reducing drugs<\/a> \u2014 both things must be true for at least a full 24 hours<\/a> \u2014 you are less contagious and can leave your home. Symptoms are considered to be improving<\/a> if you\u2019re feeling well enough to perform your daily activities.<\/p>\n For at least five days<\/a> afterward or while you have lingering symptoms, wear a mask and practice physical distancing as much as you can.<\/p>\n \u201cYou can be contagious for up to two weeks afterwards, if you\u2019re still pretty sick or if you\u2019re immunosuppressed,\u201d Millen explained.<\/p>\n The influenza diagnostic test cannot tell you how contagious a person is, said Dr. Tara Vijayan<\/a>, medical director of the Adult Antimicrobial Stewardship program at UCLA Health.<\/p>\n COVID<\/p>\n COVID is caused by the virus<\/a> more clinically known as SARS-CoV-2. You may have<\/a> a fever, cough, sore throat, muscle aches, headache, congestion or runny nose, diarrhea, fatigue, and nausea or vomiting. Losing your sense of taste or smell is another symptom observed in COVID, although that tends to be less common now.<\/p>\n If you are symptomatic, stay at home<\/a> even if your symptoms are mild, Millen said. Once symptoms start improving overall and your fever has subsided without fever-reducing drugs \u2014 again, both things must be true for at least a full 24 hours<\/a> \u2014 you are considered less contagious, and can leave your home. Wear a mask and practice physical distancing if there are lingering symptoms or if you continue to yield a positive result on a home COVID test, both experts said.<\/p>\n Sometimes, COVID symptoms worsen<\/a> one to two weeks after their initial onset. If this happens, stay home again<\/a> and follow the above protocols to avoid spreading the virus to others.<\/p>\n There are people who are asymptomatic even though they have COVID. If you fall into this camp and get a positive COVID test result, wear a mask and practice physical distancing around other people for at least five days<\/a>.<\/p>\n ljubaphoto via Getty Images<\/p>\n There are a few key factors that can generally tell you if enough time has passed that you’re no longer contagious.<\/p>\n The Common Cold<\/p>\n The common cold is caused by many different types of respiratory viruses<\/a>. Typical symptoms<\/a> include a runny or congested nose, coughing, sneezing, sore throat, fever, body aches and headache. It\u2019s similar<\/a> to the flu, but one way to differentiate it is that \u201ccolds come on gradually, usually over the course of a few days,\u201d said Millen. Flu, on the other hand, is very abrupt and intense.<\/p>\n After you begin exhibiting symptoms of the common cold, you are contagious for about seven days, Vijayan said. Once symptoms are cleared, you are no longer contagious. <\/p>\n While you are symptomatic, stay home. Once symptoms start improving overall and your fever has subsided without taking fever-reducing drugs for at least a full 24 hours<\/a>, you are less contagious and can return to daily activities. Masking and physical distancing are strongly encouraged until symptoms are healed or for at least five days<\/a>, to prevent spreading the virus to others.<\/p>\n RSV<\/p>\n RSV, or respiratory syncytial virus, is a viral infection. \u201cI call it the wheezing virus because it makes people wheeze,\u201d Millen said.<\/p>\n If you are coughing, sneezing or wheezing, or you have a fever or a runny or congested nose, there is a chance it may be RSV<\/a>. Symptoms tend to pop up in stages instead of all at once.<\/p>\n Once you start showing RSV symptoms, you are contagious for up to eight days afterward, according to the Centers for Disease Control and Prevention<\/a>. <\/p>\n You are advised to stay home<\/a> while you are symptomatic. Once symptoms start improving overall and your fever has subsided without fever-reducing drugs for at least a full 24 hours<\/a>, you are less contagious and can cease isolation. While you have ongoing symptoms, or for at least five days<\/a>, practice physical distancing and mask when you\u2019re out and about. <\/p>\n If you are immunocompromised<\/a>, you can be contagious for four or more weeks after you start developing RSV symptoms. This is true even if you no longer have symptoms<\/a>. <\/p>\n Strep Throat<\/p>\n Strep throat<\/a> is a bacterial infection that commonly presents as a sore throat without any nasal symptoms or watery eyes, Millen explained. Your throat may also feel swollen, there may be red spots on the roof of your mouth or white spots on your throat, and you may develop a fever. <\/p>\n When you start getting the symptoms of strep throat, inform your doctor so they can prescribe you antibiotics<\/a> for it.<\/p>\n \u201cOnce you start the antibiotics for strep throat, you\u2019re only infectious for about 24 hours afterwards,\u201d Millen said. Stay at home<\/a> for 24 hours from when you start taking the antibiotics, and until your fever has lifted. Besides reducing your contagiousness, the antibiotics help ease your sore throat quickly, Vijayan noted.<\/p>\n Strep throat \u201ccan be contagious for up to three weeks if you don\u2019t get antibiotics,\u201d Millen said.<\/p>\n Whooping Cough (Pertussis)<\/p>\n Whooping cough, or pertussis, is a bacterial infection with symptoms that mimic those of the common cold in the early stage of the disease, according to Millen. You might have a runny or congested nose, a very mild cough, and low-grade fever<\/a>.<\/p>\n About seven to 14 days in, the coughs worsen into violent and uncontrollable coughing fits<\/a>. During and after these fits, some people are short of breath or exhausted; they may vomit, or feel like they\u2019re going to; and they may let out the characteristic \u201cwhoop\u201d sound after the cough, according to both Vijayan and Millen.<\/p>\n According to the CDC<\/a>, pertussis is contagious from the time symptoms begin until about 14 days after the onset of the cough. <\/p>\n If you have symptoms that resemble the common cold, it\u2019s a good idea to stay home and pay attention to whether your cough worsens over time. If it does, see your doctor immediately to confirm whether you have pertussis or another illness. The antibiotic for pertussis is more effective if prescribed early<\/a>. <\/p>\n![\"There](\"https:\/\/www.newsbeep.com\/us\/wp-content\/uploads\/2025\/11\/675704b61500005700baa94b.jpeg\")
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