See: Asian flu.

Also called fowl plague, avian flu, and bird flu. A highly contagious viral disease with up to 100% mortality in domestic fowl. Caused by influenza A virus subtypes H5 and H7. All types of birds are susceptible to the virus but outbreaks occur most often in chickens and turkeys. The infection may be brought by migratory wild birds which can carry t [..]

See: Hong Kong flu.

See: Spanish flu.

1743, borrowed (during an outbreak of the disease in Europe), from Italian influenza "influenza, epidemic," originally "visitation, influence (of the stars)," from Medieval Latin i [..]

contagious disease, characterized by fever, exhaustion, and difficulty breathing. Also called the flu.

A highly contagious viral infection that affects the respiratory system. Common symptoms of the disease are chills and fever, sore throat, muscle pains, severe headache, coughing, weakness and general [..]

An acute contagious viral respiratory infection marked by fevers, muscle aches, headache, cough and sore throat.

an acute febrile highly contagious viral disease Influenza, commonly referred to as the flu, is an infectious disease caused by RNA viruses of the family Orthomyxoviridae (the influenza viruses), that [..]

A virus that spreads easily from one person to another. Sometimes called flu.

flu (pop)

also called the flu, it is a respiratory infection caused by multiple viruses. The viruses pass through the air and enter the body through the nose or mouth. The flu can be serious or even deadly for [..]

(n) an acute febrile highly contagious viral disease

  A highly contagious virus infection causing fever and severe body ache.

A contagious and infectious respiratory illness usually occurring in the winter.

Feeling suddenly feverish, achy, and crummy all over? Sounds like influenza is in your body — the full name for the flu! Influenza is a type of germ called a virus that can make you sick. You'll [..]

Infection of domestic and wild fowl and other Birds with Influenza A virus. Avian Influenza usually does not sicken Birds, but can be highly pathogenic and fatal in domestic Poultry.

An acute viral Infection in Humans involving the respiratory tract. It is marked by Inflammation of the Nasal Mucosa; the Pharynx; and Conjunctiva, and by Headache and severe, often generalized, myalg [..]

An acute viral infection in humans involving the respiratory tract. It is marked by inflammation of the NASAL MUCOSA; the PHARYNX; and conjunctiva, and by headache and severe, often generalized, myalg [..]

A respiratory infection caused by an influenza (flu) virus.

A serious disease caused by viruses that infect the respiratory tract. [6]

A highly contagious viral infection characterized by sudden onset of fever, severe aches and pains, and inflammation of the mucous membrane. [7]

A highly contagious viral infection characterized by sudden onset of fever, severe aches and pains and inflammation of the mucous membrane.

a highly infectious virus; also the name of a contagious viral illness that causes fever, myalgia, cough, sore throat, headache; can result in complications of pneumonia, Reye syndrome, myocarditis, and death

A highly contagious viral infection characterized by sudden onset of fever, severe aches and pains, and inflammation of the mucous membrane.

A viral infection of the respiratory system, causing fever, muscle pain, headache and difficult breathing.

Or the ‘flu’, is a viral infection that can cause coughing, sore throat, fever, headaches and aching muscles and joints.

An acute viral infection characterized by the inflammation of the respiratory tract. Influenza is contagious and its symptoms are fever, chills, prostration and muscular pain.

Commonly called the flu , influenza is a virus that infects the respiratory tract and may cause fever, headache, and general body aches, runny nose, sore throat, or cough.

a viral respiratory tract infection. The influenza viruses are divided into three types: A, B, and C. a viral respiratory tract infection. The influenza viruses are divided into three types: A, B, and C.

a viral respiratory tract infection. The influenza viruses are divided into three types: A, B, and C.

a viral respiratory tract infection. The influenza viruses are divided into three types: A, B, and C.

a viral respiratory tract infection. The influenza viruses are divided into three types: A, B, and C.

The medical term for the flu, an infectious disease caused by a virus.

influenza (an acute contagious disease of the upper airways and lungs)