Signs and symptoms of influenza

Flu (influenza)

signs and symptoms of influenza

Symptoms of H1N1 (Swine Flu)

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Influenza also known as the flu is a contagious viral infection that attacks your respiratory system. Influenza viruses that infect humans can be classified into three main groups: A, B, and C. Type A influenza infection can be serious and cause widespread outbreaks and disease. Common symptoms of type A infection can be confused with other conditions. While in some milder cases the flu can resolve on its own without significant symptoms, severe cases of type A influenza can be life-threatening. Unlike a common cold , the flu typically occurs with a sudden onset of symptoms. Common signs of an influenza infection include:.

Flu is different from a cold. People who are sick with flu often feel some or all of these symptoms:. Most people who get flu will recover in a few days to less than two weeks, but some people will develop complications such as pneumonia as a result of flu, some of which can be life-threatening and result in death. Sinus and ear infections are examples of moderate complications from flu, while pneumonia is a serious flu complication that can result from either influenza virus infection alone or from co-infection of flu virus and bacteria. Other possible serious complications triggered by flu can include inflammation of the heart myocarditis , brain encephalitis or muscle myositis, rhabdomyolysis tissues, and multi-organ failure for example, respiratory and kidney failure. Flu also can make chronic medical problems worse. This includes people 65 years and older, people of any age with certain chronic medical conditions such as asthma, diabetes, or heart disease , pregnant women and children younger than 5 years, but especially those younger than 2 years old.

Uncomplicated influenza. Uncomplicated influenza illness is typically characterized by the abrupt onset of constitutional and upper respiratory tract signs and symptoms e. However, many people who are sick with influenza virus infection do not manifest fever, especially those who are elderly or immunosuppressed.
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Influenza is a viral infection that attacks your respiratory system your nose, throat and lungs. Influenza is commonly called the flu, but it's not the same as stomach "flu" viruses that cause diarrhea and vomiting. For most people, influenza resolves on its own. But sometimes, influenza and its complications can be deadly. People at higher risk of developing flu complications include:. Though the annual influenza vaccine isn't percent effective, it's still your best defense against the flu. Initially, the flu may seem like a common cold with a runny nose, sneezing and sore throat.



Signs and Symptoms of Type A Influenza

Infectious Diseases: Common cold or the flu?

All you need to know about flu

Victorian government portal for older people, with information about government and community services and programs. Type a minimum of three characters then press UP or DOWN on the keyboard to navigate the autocompleted search results. The flu is a highly contagious viral infection that can cause severe illness and life-threatening complications, including pneumonia. The flu is spread by contact with fluids from coughs and sneezes. However, it is now a regular human flu virus that continues to circulate seasonally worldwide. The current seasonal influenza vaccine has been designed to include protection against the swine flu virus. Having the flu is even more likely if you have been in contact with someone who already has it, or have had some other type of exposure such as overseas travel to areas where flu outbreaks are occurring.

The flu short for influenza is a respiratory virus that affects the throat, nose, bronchi and, sometimes, the lungs. There are different types of influenza viruses and they evolve and change from year to year. For most people, the flu is an inconvenience that subsides in a few days. For others, influenza can lead to health complications, visits to the hospital and even death. Globally, 5 to 10 percent of adults and 20 to 30 percent of children get the flu each year and 3 to 5 million of these cases are severe, leading to about , to , deaths, according to the World Health Organization WHO. In the United States, there were an estimated 80, deaths and , hospitalizations from flu during the to flu season , making it the worst flu season in at least four decades, according to the Centers for Disease Control and Prevention CDC.

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