When was h1n1 outbreak

It may be instructional to look at the last major pandemic, the H1N1 influenza pandemic of This was caused by a virus from a different family of viruses than the current coronavirus outbreak. The coronavirus is a new, novel coronavirus that appears to have originated from bats before making the jump to humans. COVID is not influenza, although it behaves in some ways like influenza. It is, instead, more accurately called a highly contagious viral pneumonia.

In mild cases it results in few if any symptoms, such as cough and mild fever. In severe cases, it results in life-threatening pneumonia that can be fatal, particularly in the elderly, immunocompromised and individuals with underlying medical conditions such as heart disease, lung disease and diabetes. The virus in the pandemic is considered to be quite different from the typical H1N1 viruses that were circulating at the time. Dubbed H1N1 pdm09, very few young people had existing immunity to it, but about one-third of people over 60 years of age had antibodies against it, probably from exposure to other, older H1N1 viruses at some time in their lives.

This also meant that vaccinations for seasonal influenza offered very little protection against it. A vaccine for the H1N1 pdm09 vaccine was manufactured, but was not available in significant quantities until late November, well after the peak of the illness in the second wave of the disease and finished in the U.

This is a useful reminder as well. Even in influenza, seasonality is not a well-understood phenomenon. The relatively small number of cases that led to serious illness or death were mostly in children and young adults — particularly those with underlying health problems — and pregnant women. If you've had flu in the last few years, there's a chance it was caused by this virus.

The symptoms are the same as other types of common flu. They're usually mild and pass within 1 to 2 weeks. But as with all types of flu, some people are at higher risk of serious illness, particularly those with underlying health problems. The regular flu jab will usually protect people who are at a higher risk of becoming severely ill. Additionally, CDC estimated that ,, people worldwide died from H1N1 pdm09 virus infection during the first year the virus circulated.

This differs greatly from typical seasonal influenza epidemics, during which about 70 percent to 90 percent of deaths are estimated to occur in people 65 years and older. Though the flu pandemic primarily affected children and young and middle-aged adults, the impact of the H1N1 pdm09 virus on the global population during the first year was less severe than that of previous pandemics. Estimates of pandemic influenza mortality ranged from 0. It is estimated that 0.

However, H1N1 pdm09 virus continues to circulate as a seasonal flu virus, and cause illness, hospitalization, and deaths worldwide every year. Skip directly to site content Skip directly to page options Skip directly to A-Z link.

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