Flu Virus contagious

Influenza virus is contagious and spreading from human to human. Human will start feeling sick from one to four days after exposing to the flu virus.

Adults generally can spread the virus to others starting one day before they fell sick, and up to seven days after the symptom start.


Flu virus, transmitted by coughs, sneezes, laughs and even normal conversation, are extraordinarily contagious, particularly in the first three days.

The person will be contacted by aerosolized droplets and also with objects contaminated by mucus from an infected person.

The virus enters the body through the respiratory tract. Incubation is one to three days. The person is most contagious one day before the onset of symptoms and for up to seven days the symptoms begin. Most people will be sick from two to five days.

Fever, headache, extreme tiredness, dry cough, sore throat runny or stuffy nose and muscle are the symptoms of flu.

However, fatigue and resultant cough can last for several weeks.

Children can infect others for much longer. They are infectious for several days before they start to feel sick. They can pass the virus on for more than seven days after showing flu symptoms.

On average each year 20,000 Americans die of the flu. Because these virus are highly contagious, it is thought that public transportation is a main conduit for transmission.
Flu Virus contagious