What is the difference between seasonal flu, bird flu and pandemic influenza?

Seasonal (or common) flu is a respiratory illness that can be transmitted person to person. Most people have some immunity, and a vaccine is available. Avian (or bird) flu is caused by influenza viruses that occur naturally among wild birds.

The H5N1 variant is deadly to domestic fowl and can be transmitted from birds to humans. At this time the H5N1 virus cannot easily be transmitted from person to person. There is no human immunity to this virus and no vaccine is available.

Pandemic influenza is a worldwide outbreak of severe Rhode Islandflu caused by a virus that is new to humans. Pandemics occur when a new or markedly changed virus develops. Because the virus is new or very different from any virus seen before, there is no natural immunity (defenses) in the human population, and the disease can spread easily from person to person.

In a pandemic, many people may get sick at the same time, and many may die.

Seasonal influenza (or common flu) is a contagious respiratory illness caused by influenza viruses that can be transmitted person to person. Seasonal flu occurs every year and can cause mild to severe illness in people. Some people have a natural immunity but the best protection against seasonal flu is vaccination and hand washing.

Avian influenza (or bird flu) is caused by influenza viruses that occur naturally among wild birds. The H5N1 variant is deadly to domestic fowl and can be transmitted from birds to humans. There is no human immunity and no vaccine is available.

Swine influenza (H1N1, or pig flu) is caused by influenza viruses that occur naturally among pigs. Swine flu viruses cause high levels of illness and low death rates in pigs. Swine flu viruses do not normally infect humans.

However, sporadic human infections with swine flu have occurred. Most commonly, these cases occur in persons with direct exposure to pigs (e.g. Children near pigs at a fair or workers in the ...

The seasonal flu is caused by a flu virus already circulating in the human population. A pandemic flu will be caused by a flu virus that has not circulated among people. Seasonal flu occurs at about the same time every year, beginning in December and ending in March.

Most people who get seasonal flu recover within a week or two and do not require medical treatment. The very young, the very old and the very sick are most likely to become seriously ill from seasonal flu. Pandemic flu is more serious than a “typical” flu.

It is caused by a new flu strain that humans have not been exposed to, so they have no natural resistance or immunity to it. Pandemic flu is different from seasonal flu because it infects large numbers of people of different ages all over the world and causes serious illness and deaths. During a pandemic people are more likely to get the flu and it is more likely to be deadly, even among young and healthy people.

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