Each fall, the flu emerges as a terrible force. Influenza viruses cause millions of illnesses and thousands of deaths in the United States each year. So it's necessary to know more about the flu viruses.
What's the difference between Type A and Type B?
Influenza A viruses come in many varieties. Four subtypes commonly affect humans. But many more influenza A viruses have been identified in animals, which makes it a potential source of pandemics whenever a new type of influenza A jumps to humans. They are divided into just two lineages（谱系） that cause seasonal outbreaks.
What are symptoms of an influenza infection?
If you do get sick with the flu, you'll have common symptoms like fever, muscle aches and respiratory ailments. Most otherwise healthy people are sick for three to seven days. The flu can also trigger inflammatory（炎症反应） responses in the body and worsen existing chronic conditions like asthma or heart disease.
Some rapid tests available at doctors offices can distinguish between influenza A and B, although they tend to have low sensitivity. Doctors can also order more sensitive P. C. R. tests to identify the specific flu virus causing infection.
How do you treat influenza?
To treat the flu, we can take approved antiviral medications that are commonly used to shorten the duration and severity of illness. Stay hydrated, get plenty of rest and use over-the-counter medications to reduce fever as needed. But if you develop a sustained fever of 39℃, you have difficulty breathing or you experience severe chest or stomach pain, it is important to seek medical attention immediately.
A．How do you get tested for influenza?
B．How do you know which type you have?
C．Influenza B viruses, however, only circulate in humans.
D．In some cases, the cough and fatigue can linger for two weeks.
E．These may be signs that you need a stronger influenza treatment.
F．There are two players every flu season: influenza Type A and Type B.
G．Public health officials recommend everyone six months and older get an annual flu shot.
