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Typically, infection with an AIV has an incubation period of 3–5 days but can be up to 9 days. H5N1 and H7N9 cause severe lower respiratory tract illness, whereas other AIVs such as H9N2 cause a more mild upper respiratory tract illness, commonly with conjunctivitis. [ 1 ]
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. Influenza activity can sometimes be predicted and even tracked geographically.
A flu infection typically causes these symptoms: Fever. Cough. Sore throat. Body aches. Runny or stuffy nose. Headaches. The flu can also cause a general feeling of fatigue or malaise, Ray says ...
The flu can last for 5-7 days for healthy teens and adults, and two weeks or more for vulnerable populations. Talk to your doctor if you think you have the flu.
The incubation period. This is the period of time from when you’re exposed to the flu virus to when you develop symptoms. It usually lasts two days. The contagious period. People with the flu ...
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.
For both COVID-19 and flu, getting vaccinated is the most effective way to prevent infection or reduce the severity of symptoms if you do get sick. While there is a vaccine for RSV, it is only ...
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.