how long are viral hives contagious?
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The vast majority of hives are not contagious. Hives occur more frequently in children and in females. In general, hives decrease and disappear within about 24-48 hours if the affected individual is no longer exposed to the allergic agent.
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Typically, you're contagious from 1 day before you have any symptoms. You stay that way for 5 to 7 days after you start feeling sick.
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The bottom line The common cold is a contagious viral infection with an incubation period of one to three days. This means it could take up to three days for you to notice symptoms after being exposed to the virus.
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Cold sores are contagious until they go away completely, which usually takes about two weeks.
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If you have fifth disease, you will be contagious, which means you can spead the disease to others, for about 7 to 10 days before the rash appears.
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The incubation period is usually between 3 and 7 days from the time you are infected until you develop symptoms. You can usually spread the virus to someone else beginning about 3 days after you are infected until about 10 days after you develop symptoms.
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You are most contagious for two weeks after the cold sore initially appears, but because the virus lives in the body forever, it is always transmittable to others.
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The average length of time a person is contagious after onset of illness is six months. The EB virus remains in the body for life, and periodically can be found in small amounts in the throat in otherwise completely healthy persons.
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People with the virus are likely contagious from the day or so before symptoms first appear until about five days after symptoms begin, though sometimes people are contagious for as long as 10 days after symptoms appear. Children and people with weakened immune systems may be contagious for a slightly longer time.
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Firstly, glandular fever is not very contagious. It is passed by close contact between individuals (via saliva), and even members of the same family do not necessarily catch it from each other. The incubation period (time from infection until appearance of symptoms) is between four and six weeks.
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Usually, eruptions may last for a few minutes, sometimes several hours, and even several weeks to months. Most individual hives last no more than 24 hours.
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People infected with RSV are usually contagious for 3 to 8 days. However, some infants, and people with weakened immune systems, can continue to spread the virus even after they stop showing symptoms, for as long as 4 weeks.
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Period of Contagiousness People with flu are most contagious in the first 3-4 days after their illness begins. Some otherwise healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.
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You are most contagious in the 3 to 4 days after you start to feel sick, but you remain contagious as long as you have symptoms. Usually this is about a week, but it could be a few days more for children or people with weak immune systems. You can also pass it on a day or so before you start feeling sick.
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Symptoms of rotavirus — the leading cause of viral gastroenteritis in infants and young children — usually appear one to three days after exposure. But you're contagious even before you develop symptoms, and up to two weeks after you've recovered.
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About a week. Typically, you're contagious from 1 day before you have any symptoms. You stay that way for 5 to 7 days after you start feeling sick.
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Typical time it takes for symptoms to show up once you've caught the virus is one to four days. Adults can be contagious from the day before symptoms begin through five to 10 days after the illness starts. From: What Are Your Odds of Getting the Flu? SOURCE: Centers for Disease Control.