The amount of time it takes for influenza to become negative depends on the type of influenza a person has and the severity of the illness. Generally, it takes about seven to ten days for the virus to become undetectable in the body. During this time, a person may experience a variety of symptoms such as fever, chills, cough, sore throat, fatigue, body aches, and headache.
If the illness is more severe, it can take longer than 10 days for the virus to become undetectable. In these cases, a person may need to seek medical help to recover. In addition, a person should take measures to reduce the risk of spreading the virus to others, such as avoiding contact with those who are ill and washing hands regularly.
It is also important to note that even after the virus becomes undetectable, the body may still be contagious for up to two weeks. It is therefore important to take measures to prevent the spread of the virus even after symptoms have subsided. This includes avoiding contact with those who are ill, washing hands regularly, and avoiding touching your face with unwashed hands.
In summary, it usually takes seven to ten days for influenza to become undetectable. However, in more severe cases, it may take longer. It is important to take measures to prevent the spread of the virus even after symptoms have subsided.