Essentially, influenza (aka, “The Flu”) is a viral infection that attacks our population in a yearly cycle. Fortunately, the human immune system is there to recognize and neutralize the effects of the virus. Each year, the virus mutates just slightly and most of the population is once again susceptible to the disease. This is why a new vaccine must be created regularly to reflect the most recent influenza mutants out in the environment. Under normal circumstances, this is all you need to know about the flu (aside from how to avoid infection and take care of yourself if you do come down with it).
Recently, some changes in the status quo have raised alarm bells at the Centers for Disease Control (CDC) and the World Health Organization (WHO). There have been reports of “swine flu” in Mexico and several other countries whose citizens regularly visit Mexico, including the United States.
Putting the news figures aside for a moment, let me explain exactly what swine flu is. The influenza virus has a number of components, but the most variable parts of the virus are the spines found around its exterior. These are proteins called “peplomers” and there are two major kinds. The HA (hemagglutinin) peplomer is responsible for binding the virus to host cells and the NA (neuraminidase) peplomer allows the virus to break its bonds to the host cell once it is ready to move on. When you hear about the H1N1 virus or the H3N2 virus, the viruses are being referred to and classified by their external receptors. This is a bit of a simplification, but knowing the chemical nature of the peplomers isn’t crucial to understanding their function.
The peplomers are a double edged sword. They allow the viral particles access to the machinery of the cell (this is how viruses replicate themselves), but they also allow the immune system to recognize and target the virus. When the human flu virus mutates its external proteins, the body’s defenses still recognize them and eventually mount a response (the period of sickness occurs while the body is developing that response). If this failed to happen, you would eventually succumb to the virus and die.
The virus didn’t originate in humans, though. Birds, pigs, and even horses have their own versions of influenza. Remember the “bird flu” or “avian flu” scare a while ago? Scientists feared the influenza common in birds had “jumped the species barrier” and begun infecting humans. This is called a “zoonotic” disease – a disease that moves from animals to people. Now, the same worries have arisen about swine flu. Why does this matter? Won’t our immune system just deal with the new influenza virus the same way it has always done with the seasonal one?
Unfortunately the answer is a weak “maybe.” While your immune system might not immediately stop a new human influenza infection, it DOES recognize that new mutant and begin building a response. Avian and swine peplomers, on the other hand, are not easily recognized by the human system because our evolution did not include pressure from those particular viruses. As humans have come into close contact with the animals that carry these viruses, the animal influenza has been able to mutate enough to cross the species bridge and infect humans as well. In the past this would not have been a global problem. An infected village might just die out in isolation. Things are different now: a traveler can become infected in one region and fly thousands of miles to another, long before they experience symptoms.
So what’s the take away message from all of this? Can we do anything about this? Well as individuals it’s wise to go through the same sanitary practices as we might during flu season. Also, traveling to places which have reported cases probably isn’t a great idea. Governments and regulatory bodies like the CDC and the WHO are in an “all hands on deck” kind of status right now. As the outbreaks continue (they are expected to grow for at least the time being), these groups will be tracking any reported cases and trying to treat those infected.
There are people who have spent their whole lives preparing for just these kinds of events and they’re currently working very hard to provide the public with the best information and advice. Hopefully you now have a better understanding of the science behind influenza and zoonotic diseases.
healthmap: Malegaon Child Affected with Polio Virus Type I: http://in.news.yahoo.com/20/20100206/1416/tnl-malegaon-child-affected-with-polio-v.html
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healthmap: Malegaon Child Affected with Polio Virus Type I: http://in.news.yahoo.com/20/20100206/1416/tnl-malegaon-child-affected-with-polio-v.html
Australia’s Chief Medical Officer, Professor Jim Bishop, is calling on GPs to promote vaccination against the pandemic (H1N1) 2009 influenza to their patients before the flu season begins in Australia .
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Chief Medical Officer Mobilises GPs To Support Pandemic (H1N1) 2009 Influenza Vaccinations
The latest poll from researchers at the Harvard School of Public Health (HSPH) shows that almost half of Americans believe the H1N1 flu outbreak is over (44%), and levels of concern about getting sick with the virus continue to decline. Few (18%) think it is “very likely” there will be another widespread outbreak of the H1N1 virus in the U.S.
Original post:
Poll Finds That Nearly Half Of Americans Believe H1N1 Outbreak Is Over
At the height of fear over H1N1 flu this fall, vaccination foes claimed it was safer to get swine flu than to be inoculated against … (Source: USATODAY.com Health) MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed – updated hourly from thousands of authoritative health and news sources.
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Swine flu vaccine safe, California and CDC data show
Nearly half of Americans believe H1N1 outbreak is over, poll finds – Majority of parents got or intend to get their children vaccinated, but majority of adults will not get H1N1 vaccine themselves… (Source: Disabled World) MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed – updated hourly from thousands of authoritative health and news sources
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50% of Americans Believe H1N1 Outbreak is Over
Nearly half of Americans believe H1N1 outbreak is over, poll finds – Majority of parents got or intend to get their children vaccinated, but majority of adults will not get H1N1 vaccine themselves… (Source: Disabled World) MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed – updated hourly from thousands of authoritative health and news sources.
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50% of Americans Believe H1N1 Outbreak is Over
After nearly a year of headlines, worry and confusion, the H1N1 swine flu virus is now out of the news. Is it out of circulation as well
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As Swine Flu Fades, Experts Ponder Next Season
Most Americans do not intend to get the swine flu vaccine, assume the pandemic is over and think the flu threat was overblown, according to a poll released Friday by the Harvard School of Public Health. (Source: NYT > Health) MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed – updated hourly from thousands of authoritative health and news sources.
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Most Americans Think Swine Flu Pandemic Is Over, a Harvard Poll Finds
Federal health officials urged Friday that more Americans get vaccinated against the H1N1 flu virus, sometimes referred to as swine flu, which continues to kill. (Source: CNN.com – Health) MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed – updated hourly from thousands of authoritative health and news sources.
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H1N1 flu continues to kill, CDC warns
This week the great swine flu scare was finally called off. Now the question: was it all whipped up by drug giants to line their pockets?
