How Long Are You Infectious With A Cold
How Long Am I Contagious?
Medically Reviewed past Jennifer Robinson, MD on Nov xiv, 2021
Flu
You can really infect someone before you start feeling symptoms of the flu.You are most contagious in the iii to 4 days after you start to experience ill, but you remain contagious as long equally you have symptoms. Commonly this is about a week, but it could be a few days more than for children or people with weak immune systems. You tin can also pass it on a day or so before you commencement feeling sick. Some people can transfer the virus without ever getting symptoms.
Cold
A cold frequently starts with a runny nose and sore throat, followed by coughing and sneezing. Y'all're contagious a twenty-four hour period or two earlier this starts and for as long as you feel sick, normally a week or 2. It may be longer if y'all already have animate problems or a weak allowed system. Yous're more probable to infect others during in the first few days, when symptoms are at their worst.
COVID-xix
Caused by the virus SARS-CoV-two, this infection can cause fever, chills, trouble breathing, torso aches, fatigue, cough, and nausea. But you can spread the virus 2 to iii days before you observe any of these signs. You can besides pass information technology on to others if you lot aren't showing symptoms. If yous are sick, you can be contagious for a while, and then stay away from others until your symptoms improve and you've been without a fever for three days in a row. If you examination positive for the virus but don't have symptoms, it'due south best to keep away from others for 10 days to see if you get sick.
Mononucleosis
This viral illness is besides known equally the kissing affliction because that'due south one of the means you lot can laissez passer information technology on to others. You might be contagious from the moment you lot're infected, and that isn't good because it frequently takes iv-7 weeks earlier y'all observe any of its flu-like symptoms. You tin can spread the disease the entire time you accept it. Even once y'all feel better, y'all may be able to pass on the virus for as long as 18 months.
Norovirus
Information technology can crusade diarrhea, nausea, stomach hurting, vomiting, headache, fever, and trunk aches. Just a few norovirus particles (your body sheds billions) tin infect another person, nigh oftentimes by touching food or kitchen tools. Yous're most contagious when y'all're sick and for a few days later on, merely you tin still spread it for 2 weeks or more after you feel ameliorate. Make clean your hands regularly and wash nutrient thoroughly to preclude spreading norovirus.
Conjunctivitis (Pinkeye)
Germs, irritants, or allergens can inflame the tissue, known every bit the conjunctiva, that lines your inner eyelid and the whites of your eyes. Your centre might be red, itchy, or watery. When it'southward caused past leaner, your eye may fill with pus. You can spread it to others for as long equally you notice symptoms or for 24 hours later on you kickoff antibiotic drops. The milder viral grade is contagious while yous have symptoms and for a mean solar day or two before.
Measles
Vaccines make it rare in the U.S., simply worldwide, thousands dice yearly from this virus, about under age 5. Information technology causes a dry cough, sore pharynx, runny olfactory organ, fever, and a distinctive rash of tiny crimson bumps, some raised. It spreads easily, hanging around in the air for 2 hours after y'all cough or sneeze. In one case the rash appears, you've already been contagious for 4 days. Yous'll stay that way for four days afterward it goes away.
Hand, Human foot, and Mouth Illness
This virus, mutual in young children, causes a red rash on the hands, anxiety, or bottom. It also may cause a fever, sore throat, and painful, blistering sores in the oral cavity. You're nearly contagious the first week, but some people tin can still laissez passer information technology on for weeks. You tin go it from a simple cough, sneeze, or contact with spit or open blisters. It's best to keep yourself or your child home if you accept hand, pes, and mouth disease.
Whooping Cough
Nearly unsafe to babies, this bacterial infection has reappeared more than recently in all ages because of missed vaccinations and booster shots. The "whoop" refers to the telltale sound your chest makes as yous breathe in after a coughing fit, though this may not happen in teens or adults. You tin pass information technology on, by and large through tiny droplets in the air, for 2 to iii weeks later the coughing starts. Antibiotics may exist able to shorten this time.
Impetigo
Young kids virtually often get these contagious sores on the face, cervix, hands, or butt. They may be unbroken, or wet and red, or crusty and yellow. The leaner ofttimes get in when you cut, scrape, or irritate the skin. You tin transfer it to other people who touch the sores. Proper handwashing could aid foreclose it. Doctors apply antibiotics in a pill or ointment to kill the bacteria.
MRSA
Skin infection with MRSA, a type of staph bacteria called Staphylococcus aureus, could be serious because information technology doesn't respond to several antibiotics. You may accept sores, bumps, or a swollen cutting with pus inside. You tin can give a MRSA infection to someone if they make contact with your infection or anything that touched it. If you have a MRSA infection, complete all treatments and follow your doctor's instructions and then it won't spread to others.
Eastward. coli
It'south i of the about mutual causes of bacterial diarrhea, merely there are others like campylobacter, salmonella, and shigella. You can pass these bacteria on to others when yous bear upon food or surfaces with unwashed hands, or by swimming in a pool when you've been sick. Information technology'south contagious while you're sick, and sometimes longer. Regular bathing and handwashing are the best ways to protect others and yourself.
Chest Common cold
Sometimes called bronchitis, it happens when regular cold symptoms motion down to inflame your lungs, which makes yous cough. But whether information technology's a cold, the flu, or some other virus, the rule of thumb is the same: You're contagious for as long as you have symptoms, and possibly a little bit longer. To stop the spread, keep your easily clean at all times and comprehend your mouth when yous sneeze or cough.
Chickenpox
This viral rash causes a fever or sore throat and telltale itchy spots all over your torso. A new vaccine means nearly kids don't become it anymore. Just if yours do, it'southward very contagious. Keep them home until all the sores chaff over.
Shingles
One time y'all've had chickenpox, the virus lives on within your body. It may come dorsum later, oftentimes in middle age, every bit shingles, a painful, blistering rash. The chickenpox virus lives within these blisters. Although the liquid that oozes out tin can't give someone else shingles, it can requite them chickenpox if they oasis't had information technology and haven't been vaccinated.
Poison Ivy
Similar its cousins, poison oak and poison sumac, its leaves have an oily sap (urushiol) that tin can make your skin red, swollen, and itchy. Until you wash it off with soap and water, y'all can pass the oil to someone who touches it, or to other parts of your trunk. Absurd showers and calamine lotion can aid save the crawling. It should be gone in a calendar week or two.
Source: https://www.webmd.com/cold-and-flu/ss/slideshow-how-long-contagious
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