Flu

Health encyclopaedia - Alphabetical Topic List

| A |

| B |

| C |

| D |

| E |

| F |

| G |

| H |

| I |

| J |

| K |

| L |

| M |

| N |

| O |

| P |

| Q |

| R |

| S |

| T |

| U |

| V |

| W |

| X |

| Y |

Flu (also known as influenza) is a disease of the lungs and upper airways caused by infection with a flu virus. The virus spreads in the lungs and airways. There are three flu viruses, known as A, B & C.

The main symptoms are a high temperature that comes on quickly with general aches and pains. There is often a loss of appetite, nausea and a harsh dry cough. For most people symptoms peak after 2-3 days, and they begin to feel much better with-in 5-8 days, although a cough and general tiredness may last for 2- 3 weeks.

The flu virus is usually spread in the small droplets of saliva coughed or sneezed into the atmosphere by an infected person. Direct contact with hands contaminated with the virus can also spread infection.

It takes between 1- 4 days (average 2 days) to go from being infected to having the full symptoms. People with flu are usually infectious a day before symptoms start and remain infectious for approximately 5 days after the start of the flu symptoms. Children and people with lowered immune systems may remain infectious for longer. It is therefore wise to avoid all unnecessary contact with others during the infectious period.

Flu usually occurs during the winter months, from October to April in the UK.

Complications such as a chest infection affect a few people who are elderly or have certain medical conditions, which can result in serious illness and can be life threatening.

The number of people who consult their GP with flu-like illness during the winter varies considerably from year to year (usually between 50 and 200 for every 100,000 population). However healthy people with flu do not need to consult their G.P.

An epidemic can be declared if more than 400 people per 100,000 of the population consult their GP with flu or a flu-like illness every week. Flu-like illness describes a variety of other illnesses, which result in similar symptoms.