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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.

Many medical professionals hear the question all the time, how long does a fever last? A fever really does not last more than 2-3 days, unless there is a major underlying cause. It is important to take the individual to the doctor if the fever is extremely high or lasting more than the normal amount of time. While the average baseline for a body temperature is 98.6 F, some variation is allowed for determining a person's fever. These people include: 1 the very young. 2 people 65 or older. 3 people with chronic illnesses, such as asthma, heart disease, HIV, or diabetes. 4 pregnant women. 5 people with a body mass index (BMI) of 40 or higher. The flu vaccine is a specific and effective way to prevent the flu. It is available for children over 6 months old. Children under 9 years old need two doses of the vaccine the first year they get it. The flu can take many forms. Classically, the flu begins abruptly, with a fever in the 102 to 106 degree range, a flushed face, body aches, and marked lack of energy. Some people have other systemic symptoms such as dizziness or vomiting. The fever usually lasts for a day or two, but can last five days. Somewhere between day 2 and day 4 of the illness, the "whole body" symptoms begin to subside, and respiratory symptoms begin to increase. How long does a fever last? Pyrexia is the proper medical term for a fever. To be classified as a fever, one's body temperature must be above the normal 98.6. Some people in the medical community do not believe that it is a true fever unless the body temperature rises above 101 degrees. If you get the flu, you should get rest and drink plenty of fluids. 1 Take pain relievers to lower your fever and relieve the aches, such as: 2 acetaminophen (Tylenol) 3 ibuprofen (Advil, Motrin) 4 naproxen (Aleve) Popular Posts. 1 How Long Does Mail Take. 2 How Long Does The Flu Last. 3 How Long Does Suboxone Stay in Your System. 4 How Long Does It Take To Get Mri Results. 5 How Long Does It Take To Digest A Meal. 6 How Long Does It Take To Become An Architect. 7 How Long Does It Take To Lower Blood Pressure. Some people are at increased risk for complications from influenza. 1 These people include: 2 the very young. 3 people 65 or older. 4 people with chronic illnesses, such as asthma, heart disease, HIV, or diabetes. 5 pregnant women. 6 people with a body mass index (BMI) of 40 or higher. While it is unclear when the fever begins what the body is really fighting, the real test is to ensure that it does not last more than 3 days. A fever that lasts 10-15 days is called a prolonged fever. While a fever is certainly not something to mess around with, there is now way to definitively state the answer to the question on most sufferers minds, how long does a fever last? Anything over 3 days needs medication attention to make sure that there is nothing more serious underlying. How long does it last? Inhaling droplets from coughs or sneezes is the most common way to catch the flu. Symptoms appear 1 to 7 days later (usually 2 to 3 days). Symptoms (except the cough) usually disappear within 4 to 7 days. Sometimes there is a second wave of fever at this time. The cough and tiredness usually lasts for weeks after the rest of the illness is over. Query: how long does the fever last with flu
Output:
The fever usually lasts for a day or two, but can last five days with flu.