.
Why is H5N1 bird flu so lethal?
The H5N1 bird flu virus concentrates in the throat, seems to spread through the blood stream from the respiratory tract into the gastrointestinal
tract and on to other organs, according to the Oxford University Clinical Research Unit in Vietnam.
H5N1 replicates rapidly after it enters the body, causing a massive inflammatory response called a "cytokine storm" that wipes out the lungs and
other organs. A cytokine storm is like a fatal allergic reaction.
Containing and managing the coming pandemic hinges on early diagnosis, and
effective antiviral treatment to prevent the cytokine storm, say
medical researchers. Unfortunately, early diagnosis and effective antiviral treatment is too expensive for most of the world's population. As per
usual, it's all about money.
The team from the Oxford University Clinical Research Unit at the Hospital for Tropical Diseases in Ho Chi Minh City looked at 18 people infected
with H5N1 and eight infected with normal human flu.
Dr. Menno de Jong and colleagues concluded, “The focus of clinical management should be on preventing this intense cytokine response, by early
diagnosis and effective antiviral treatment.”
The study appears in the journal Nature Medicine.
Vietnam Scientists Discover Why Bird Flu Is So Deadly
***
The H5N1 virus kills its victims with a high virus load that causes a massive inflammatory response, a Vietnam team has found. ...The results
detailing the behaviour of the H5N1 virus were published in Monday's edition of Nature Medicine.
Tests showed that H5N1 puts higher loads of virus into victims' throats, as opposed to their nose - like a human flu would do. The virus also
replicates to much higher levels than a common flu. A victim's immune system responds by an intense inflammatory response, say the researchers. This
response, combined with the effects of the virus, is the real killer.
Scientists
find out how bird flu kills people
***
Thirteen patients with the H5N1 virus died and the virus was found in the blood of at least 9 of them, and also in the rectums of most of them, which
suggests it could have spread from the respiratory tract through the blood stream into the gastrointestinal tract.
The team also found that levels of cytokines were much higher in H5N1 patients than in the human flu cases and again, the highest levels of cytokines
were found in those who died of H5N1. ...De Jong says that with the H5N1 infection, the cytokine response appears to be very, very intense which can
damage the body by working against the cells and organs.
De Jong says the high levels of the virus triggered an overwhelming inflammatory response that contributed to lung dysfunction and eventual death and
says there is a need to stop the virus replicating as soon as possible in order to prevent damage to the lungs and prevent the inflammatory response
to the virus. ...They note however that early diagnosis is a particular challenge in remote places where health services are often scant. ...It is
of particular concern in poor and remote farming areas where families live in close contact with their poultry which is also an essential source of
both food and income.
Why H5N1 bird flu is so lethal
But finding effective treatments for new viruses is not easy - as this SARS study shows.
None of the treatments used to treat SARS patients appears to have helped, researchers reported on Tuesday in a study that illustrates how
difficult it is to battle newly emerging viruses. ...Their systematic review of all the studies done on the 2003 SARS epidemic fails to show any
evidence that antivirals, steroids or other therapies helped patients. A few suggested they caused harm.
Some SARS survivors have been permanently disabled by the illness, treatment or both.
If there is another outbreak of SARS or some other new virus, the group recommended coordinated efforts from the beginning to assess which treatment
works best.
No treatments helped SARS victims, study finds
Meanwhile, H5N1 bird flu continues to spread.
Confirmed: Bird Flu in Juba, Southern Sudan,
and
Ugandan gov't issues bird flu alert.
And -
The European Commission (EC) says the risk of contracting bird flu is expected to rise
in the fall. The EC's warning accompanies an announcement from Dermasalve Sciences saying the company has developed a hand gel that kills the
H5N1 bird flu virus "within 30 seconds of a single application."
The maker of a new hand gel says the product kills the deadly H5N1 bird flu virus. ...Dermasalve Sciences says it tested the gel and found it had
a 99.99 percent success rate in killing the avian flu virus within 30 seconds of a single application. ...The company says the gel's active
ingredient will continue working for 30 minutes.
...No word about side-effects though. But our entire economic system is built on the premise that the 'cancer later' payment option is
always a better deal than paying cash today. So who cares?
Finally, the International Monetary Fund (IMF) is on again about a global crash - saying the risk of a global crash is increasing. The IMF report
lists the five major risks threatening the global economy - and bird flu made the cut.
Financial markets have failed to price in the risk that any one of a host of threats to economic stability could materialise and deliver a
massive shock to the world economy, the International Monetary Fund warned yesterday. ...The world's chief financial watchdog said the financial
system had so far proved resilient in the face of recent price falls but warned the risk of a crash had increased. And when it comes to worrying
about a crash in the financial markets that could deliver a body blow to the world economy, it seems that all roads lead to the US.
The IMF highlighted five major risks, all but one of which can be attributed to a greater or lesser extent to the economy and foreign policies of the
US administration. Not that the politically savvy IMF phrases it exactly like that. ...Its message coincided with a stark warning from HSBC, one
of the world's largest investment banks, that it had put the US on alert for "recession risk".
Other dangers included: ...A mutation in the avian flu virus that would lead to a "sharp decline in economic activity". ..."In these circumstances
it is reasonable to wonder whether financial markets might react to less favourable developments in a way that would amplify - rather than dampen -
the emerging risks." The trigger for a shock to asset prices can come out of the blue, perhaps a natural disaster or a health epidemic such as
bird flu. ...The IMF reiterated its fears that an outbreak would reduce investors' appetite for risky investments, cut capital flows between
companies and weaken financial systems as absenteeism rose.
IMF: risk of global crash is increasing
.
format
[edit on 13-9-2006 by soficrow]