Yes
Influenza is a contagious disease caused by influenza viruses that infect the respiratory tract (nose, throat, and lungs). It can cause mild to severe illness, sometimes leading to death. Influenza symptoms often begin suddenly, with fever, headache, tiredness, dry cough, sore throat, nasal congestion, and body aches. The best way to prevent influenza is to get vaccinated each year. Person to Person. People with flu can spread it to others up to about 6 feet away. Most experts think that flu viruses are spread mainly by droplets made when people with flu cough, sneeze or talk. These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs. The Flu Is Contagious. 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. The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. Some people, such as older people, young children, and people with certain health conditions, are at high risk for serious flu complications. 1 The flu is worse than the common cold, and symptoms such as fever, body aches, extreme tiredness and dry cough are more common and intense. 2  People with colds are more likely to have a runny or stuffy nose. Influenza, more commonly referred to as flu, impacts people of all ages. Influenza is a highly contagious viral infection of the nose, throat, and lungs that occurs most often in the late fall, winter, and early spring. It is a serious infection that affects between 5-20% of the US population annually. Fever, chills, fatigue, body aches, sore throat, and headache are common symptoms of flu. Not everyone with flu will have a fever. The flu can cause mild to severe illness, and at times can lead to death. The flu is different from a cold. The flu usually comes on suddenly. Children may pass the virus for longer than 7 days. Symptoms start 1 to 4 days after the virus enters the body. Information about how long a person is contagious is available at How Flu Spreads. Influenza (or flu) is a highly contagious viral respiratory tract infection. An estimated 5 to 20 percent of the population in the US contract influenza each year. Influenza is characterized by the abrupt onset of fever, muscle aches, sore throat, and a nonproductive cough.  Seasonal influenza, commonly called “the flu,” is caused by influenza viruses, which infect the respiratory tract (i.e., the nose, throat, lungs). Unlike many other viral respiratory infections, such as the common cold, the flu can cause severe illness and life-threatening complications in many people. Children may pass the virus for longer than 7 days. Symptoms start 1 to 4 days after the virus enters the body. Information about how long a person is contagious is available at How Flu Spreads. Influenza A is considered to be contagious between people. Generally the infectious agent may be transmitted by saliva, air, cough, fecal-oral route, surfaces, blood, needles, blood transfusions, sexual contact, mother to fetus, etc. Influenza A, although infectious, is not a genetic disease. It is not caused by a defective or abnormal gene. The contagious disease, Influenza A, can be transmitted: 1  from person to person by saliva, air, coughing, contact, surfaces, fecal-oral route, etc. About contagion and contagiousness: Contagion and contagiousness refers to how easily the spread of Influenza A is possible from one person to another. Other words for contagion include infection, infectiousness, transmission or transmissability. The flu is contagious a day before and five days to a week after its onset. Young children, people over 65, those with compromised immune systems, and people with a terminal illness are at risk of death from the flu. Pregnant women are also at greater risk. The flu can also cause premature birth.  Flu, or influenza, is a contagious respiratory in fection caused by a variety of flu viruses. Symptoms of flu involve muscle aches and soreness, headache, and fever. 
https://www.dhs.wisconsin.gov/influenza/index.htm http://www.cdc.gov/flu/about/disease/spread.htm https://www.health.ny.gov/diseases/communicable/influenza/fact_sheet.htm http://www.nfid.org/idinfo/influenza http://www.cdc.gov/flu/about/qa/disease.htm http://uhealthsystem.com/health-library/respire/upper/flu2 http://www.cdc.gov/flu/about/qa/disease.htm http://www.rightdiagnosis.com/i/influenza_a/contagious.htm http://www.healthline.com/health/cold-flu/contagious http://www.webmd.com/cold-and-flu/flu-guide/advanced-reading-types-of-flu-viruses
is influenza a contagious