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Health Conditions Discover Plan Connect. Medically reviewed by Elaine K. Luo, M. Contagiousness Transmission Early symptoms Early treatments Duration Takeaway The common cold is a viral infection that affects your upper respiratory tract.
Back to Infections. The length of time you're infectious for after having a viral infection depends on the type of virus involved. The length of time that bronchitis is infectious varies, depending on its cause. In most cases, bronchitis is caused by the same viruses that cause the common cold or flu, and you're likely to be infectious as long as you have cold or flu symptoms. Chickenpox is infectious from 2 days before the spots appear to until they have crusted over, usually 5 days after they first appeared.
The common cold is infectious from a few days before your symptoms appear until all of the symptoms are gone. Most people will be infectious for around 2 weeks. Symptoms are usually worse during the first 2 to 3 days, and this is when you're most likely to spread the virus.
Flu is usually most infectious from the day your symptoms start and for a further 3 to 7 days. Glandular fever isn't particularly contagious and can usually only be spread through direct contact with saliva, which is why it's sometimes called "the kissing disease". Speak with a pharmacist to ensure that cold medications and remedies are safe to take before trying them.
Some are not suitable for children. It is also important to let a pharmacist know of any health conditions a person has, especially diabetes or high blood pressure , as certain OTC medications can worsen these conditions.
There are numerous cold remedies that people believe can treat cold symptoms, although many do not have scientific research supporting them. However, there is some evidence that honey and zinc may help to a small degree. A review notes that in one study, children over 12 months slept better and coughed slightly less when they took a dose of honey before bedtime. People can also add the substance to a hot drink to soothe the throat.
However, do not give honey to children under the age of 12 months. The same review also found some evidence that taking zinc may reduce the frequency of colds during the winter.
However, they also found a high risk of bias, so this may not be a reliable result. People cannot use antibiotics to treat colds because viruses cause colds, not bacteria. Additionally, there is no strong evidence that vitamin C, echinacea , or garlic will shorten the duration of a cold. Once people contract a virus that causes the common cold, they can begin transmitting it to others, even if they are not experiencing symptoms yet.
This means a person can pass on cold viruses up to 2—3 days before they show signs of a cold. After symptoms develop, people remain contagious for as long as they have them. This can mean they are able to spread the cold virus for up to around 2 weeks. The common cold spreads when people come in contact with the viruses that cause it.
This may happen when a person touches surfaces that have the virus on them. If they then touch the nose, mouth, or eyes, the virus can get inside the body. People can also acquire respiratory viruses by inhaling droplets that come from coughs and sneezes. While most individuals experience mild symptoms during a cold, some are vulnerable to complications.
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