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A seven-flue chimney in a four-storey Georgian house in London, showing alternative methods of sweeping. A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. [1]
Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days.
Influenza A virus (IAV) is the only species of the genus Alphainfluenzavirus of the virus family Orthomyxoviridae. [1] It is a pathogen with strains that infect birds and some mammals, as well as causing seasonal flu in humans. [2]
This is a timeline of influenza, briefly describing major events such as outbreaks, epidemics, pandemics, discoveries and developments of vaccines.In addition to specific year/period-related events, there is the seasonal flu that kills between 250,000 and 500,000 people every year and has claimed between 340 million and 1 billion human lives throughout history.
Influenza ward at Walter Reed Hospital, in Washington, D.C., during the 1918 flu pandemic. An influenza pandemic is an epidemic of an influenza virus that spreads across a large region (either multiple continents or worldwide) and infects a large proportion of the population.
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere . It takes approximately two days to show symptoms.
The influenza vaccine is indicated for active immunization for the prevention of influenza disease caused by influenza virus subtypes A and type B contained in the vaccine. [ 74 ] [ 75 ] [ 76 ] The US Centers for Disease Control and Prevention (CDC) recommends the flu vaccine as the best way to protect people against the flu and prevent its ...
On November 7, the CDC reported asymptomatic bird flu infection in 4 workers at dairy farms. The workers didn't recall ever being sick but had antibodies showing that they had been infected with bird flu. [98] On November 22, the CDC confirmed the first case of bird flu in a U.S. child, being the 55th case of bird flu in humans in the U.S.