Bacterial pneumonia(细菌性肺炎) Dehydration(脱水) Sinus problems and ear infections (primarily in
children) 窦问题和耳部感染（主要是儿童） Worsening of preexisting conditions, such as
Speaker: Chen jia Maker: Xue bei
Zhao yanling Wang Xiqi
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Content 1 What Is the Flu? 2 Flu Symptoms 3 How Flu Works? 4 Types of Flu 5 Prevention
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What Is the Flu?
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H1N1 Influenza (Swine Flu)
H1N1 influenza is a type of influenza A. It is known as swine flu because it primarily infects pigs. Transmission to humans is uncommon, but it can occur if humans come into contact with infected pigs or with environments contaminated by the virus. An infected human can then spread the disease to other humans.
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What Is the Flu?
Second definition
The flu is a respiratory illness caused by the influenza virus. The flu is not the same as a cold, although they share many of the same symptoms. The cold is caused by a different virus, and it tends to have milder symptoms than the flu . Colds are also less likely to cause serious complications.
First definition
Flu is also called the influenza. It's an infection that causes a fever, chills, cough, bodyaches, headaches, and sometimes earaches or sinus problems.
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Flu Symptoms
The flu also weakens the immune system, leaving it vulnerable to more serious infections.High-risk individuals in particular are susceptible to serious complications.such as:
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Flu and the Common Cold
The flu and the common cold have similar symptoms. It can be difficult to tell the difference between them.
In general, the flu is worse than the common cold, the flu tends to be more severe and usually comes on suddenly, at times it can lead to death.
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Types of Flu
There are three types of flu viruses: A, B, and C.
Influenza A can infect a range of mammals and birds as well as humans, while types B and C infect mainly humans..Flu Symptoms
1、Cough 2、Sore throat(喉咙痛) 3、Headaches 4、Muscle or body aches 5、Fever or feeling feverish/chills（发烧 或感觉发热/寒战） 6、Runny or stuffy nose（流鼻涕、鼻塞） 7、Fatigue (tiredness) 8、Some people may have vomiting and diarrhea
Learning whether it is a cold or flu is important because the flu can have serious complications such as pneumonia （急性肺炎）or even death. Treating flu within 48 hours of symptoms is best. Prescription antiviral drugs may cut the time you're sick.
asthma or diabetes（哮喘或糖尿病）
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How Flu Works
1.The virus enters the respiratory tract.（呼吸道） 2.After entering the respiratory tract , the virus starts to replicate itself. The respiratory tract becomes swollen and inflamed. 3. Once inside the respiratory system , the virus enters the bloodstream . the first symptoms(cough) begin to show.