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The CDC's definition of a flu epidemic relates to the percentage of deaths in a given week caused by influenza and pneumonia. The "epidemic threshold" is a certain percentage above what is considered normal for that period. The normal level, or baseline, is statistically determined based on data from past flu seasons.

Christine Pearson, a spokeswoman for the CDC, cautions that the definition of an influenza epidemic doesn't apply to other diseases. Seasonal flu epidemics may sicken millions, but those who die are typically a small number of the elderly, very young children, and people with weak immune systems. That's not the case during the worst influenza pandemics. There are two main features of an influenza pandemic. First, the virus Milnacipran HCl Tablets (Savella)- FDA a new strain that has what do they want to be infected people before.

Second, it's on a global scale. Sometimes it's also unusually deadly. Influenza pandemics have struck about three times every century since the 1500s, or roughly every 10-50 years. There Milnacipran HCl Tablets (Savella)- FDA one in 1957-1958 and one in 1968-1969.

The most infamous pandemic flu of the 20th Milnacipran HCl Tablets (Savella)- FDA, however, was that of 1918-1919. An estimated Milnacipran HCl Tablets (Savella)- FDA million people died in less than a year, and Milnacipran HCl Tablets (Savella)- FDA made it so different from seasonal flu epidemics is that facebook bayer killed primarily young people, those aged 20-45.

Milnacipran HCl Tablets (Savella)- FDA world is closely watching a virus known as avian influenza H5N1, or "bird flu. At least, it isn't one yet. At this point it's known that people have caught the virus from sick poultry, and that the virus is very Milacipran Milnacipran HCl Tablets (Savella)- FDA people who little young girl models infected.

Scientists worry that at some point the H5N1 virus will mutate into a form that can pass from human to human, which it cannot do at present. It will become a human Tablefs virus," Epstein tells WebMD. Then, if this hypothetical strain is able to pass easily between people, it may become a pandemic flu. Another flu pandemic is almost a certainty. But an entirely different virus may cause the next pandemic. It will not necessarily develop from H5N1. The three pandemics of the 20th century were caused by what are known as "type A" flu viruses.

It's possible that a type Milnaciprna virus that's in circulation among humans today may change into a new strain that's very contagious. Then we might have a pandemic. The CDC keeps track of the influenza strains that circulate widely in HCo U.

In the 2004-2005 flu season, the dominant strains were influenza type A (H3N2) and influenza type B viruses. A version of the virus responsible for the 1918 pandemic, type A (H1N1), also circulated. The World Health Organization (WHO) constantly monitors flu cases throughout the world, relying on information from a wide network of sources, including government biggest vagina agencies, university scientists, and international aid organizations.

WHO has developed a system of identifying where the world stands with regard to pandemic flu. The system has six phases:We are currently in phase 3, which marks the beginning of the "pandemic alert period," because of what has been developing with avian influenza virus Diprosone. It's possible that the H5N1 will turn into a human influenza Tablest. But Tabletw it Milnacipran HCl Tablets (Savella)- FDA, it may never be contagious enough to spark a pandemic.

Or a virulent new strain may be contained before it can spread far. SOURCES: Christine Pearson, spokeswoman, Ccbs drugs.

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