Q: Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.
Cold symptoms can differ from person to person, but they generally appear about one to three days after exposure to a cold-causing virus. In most cases, cold symptoms will peak around day four and taper off around day seven. The signs that you have a cold usually develop slowly. How long does it take for Chlamydia symptoms to show in men? Why do bruises sometimes take so long to show? How long does the cold virus incubate before showing symptoms? When can an elderly person go out with this bad flu season? How long does it take for a lung cancer to cause symptoms? How long should I wait to drink alcohol after taking medicines? How long does it take to heal after a fever? Flu symptoms usually start within one to four days after infection. Unlike a common cold, the effects of an influenza virus infection can come on very suddenly. The first signs of the flu are often a fever or chills, accompanied by headache, sore throat, dry cough, runny nose, muscle aches, and fatigue. Even in healthy people who don't develop flu complications, the flu itself can cause symptoms that may persist for weeks, including: 1 Fatigue. 2 Weakness. 3 Low appetite. 4 Dry cough. 5 Airway irritation that affects how long you can be active. 6 Loss of sense of smell, which in rare cases becomes permanent. An adult infected with influenza may be contagious from one day before symptoms start to 5 to 7 days after becoming sick. Children may continue to be contagious for longer than 7 days. Staying home until your contagious period has likely passed will help you avoid passing the flu on to other people. A person with the flu may experience fever, chills, sore throat, dry cough, headache, fatigue, muscle aches. The symptoms can last two to seven days. Children can sometimes suffer from nausea and vomiting, but these symptoms are uncommon in adults. Most healthy adults may be able to infect other people beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick. Children may pass the virus for longer than 7 days. Symptoms start 1 to 4 days after the virus enters the body. That means that you may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick. Some people can be infected with the flu virus but have no symptoms. During this time, those persons may still spread the virus to others. A bout of the flu typically lasts one to two weeks, with severe symptoms subsiding in two to three days. However, weakness, fatigue, dry cough, and a reduced ability to exercise can linger for three to seven days. How Long Is the Flu Contagious? As the illness progresses, a person may have warm, flushed skin, watery or bloodshot eyes, a severe cough that brings up phlegm, nasal congestion, and nausea and vomiting. A bout of flu typically lasts one to two weeks, with severe symptoms subsiding in two to three days. However, weakness, fatigue, dry cough, and a reduced ability to exercise can linger for three to seven days. How Long Is the Flu Contagious? A 2013 survey conducted by the National Foundation for Infectious Diseases revealed that 41 percent of people think the flu is only contagious after symptoms start. That's not true. Answer Wiki. For influenza in particular, as Quora User says, a typical incubation period would be 1-4 days. That's a reasonable range for many other viruses, too, especially respiratory viruses. Gastrointestinal viruses probably average a little shorter incubation time. Query: how long does flu take to show symptoms
A:
Flu symptoms usually start within one to four days after infection.