Hey, whaddya know, perhaps recombinant technology has come home to
roost. No, I'm not joking, I think this is an indication of how war and
terrorism may soon be conducted; the biggest military is no longer bound to
win, in fact we may all lose. And it doesn't take a huge university and a
fancy lab - or any lab at all, really - it can happen in nature, it can
happen in the college biology lab's sink, so to speak.
At 07:04 PM 4/2/03 -0500, you wrote:
April 1, 2003, 8:47 PM EST
Amid heightened concern about the new illness known as Severe Acute
Respiratory Syndrome, the mystery of just what it is deepens.
Scientists working on the Toronto outbreak reported that the agent
responsible is "a novel virus that is not closely related to any of the known
clustersâ of coronaviruses, the prime family of suspected microbes.
An analysis of cases in Hong Kong from February 22 to March 22 found the
virus was not hitting the customarily susceptible populations -- the very
young and very old -- as the mean age of patients was 52. Similarly, few
patients were smokers or people with underlying health problems. Autopsies
revealed the virus caused parts of the lungs to hemorrhage blood, as would be
the case with a hemorrhagic fever virus such as Ebola.
And as numbers of cases around the globe continued to rise, leading to such
dramatic measures as Hong Kong sending more than 240 residents to quarantine
camps, an airplane was detained Tuesday on the tarmac at the San Jose,
Calif., airport after five people on board complained of symptoms. Medical
officials wearing face masks boarded the plane and transferred three
passengers to an ambulance, which took them to a hospital. Doctors eventually
determined that none of the five was showing signs of the disease.
"If every flight coming from Asia has to go through a similar process, I just
don't see how this is possible,â said Santa Clara County Health Department
official Karen Smith.
The findings about the Toronto and Hong Kong outbreaks are reported in the
New England Journal of Medicine. Dr. Allison McGreer and her colleagues in
the Canadian SARS Study Team isolated viruses from several patients,
performed genetic analysis of the viral RNA and concluded that the culprit's
"conserved regionâ -- the hallmarks of a species -- is 78 percent identical
to similar sections of genes found in common coronaviruses.
But the study found other sections of the virus' RNA bear no resemblance to
any known coronavirus, either human or animal.
The disease detective who led the World Health Organization team that scoured
SARS medical records last week in Beijing said in an interview Tuesday that
as-yet unpublished data indicate the virus "looks more like an animal
coronavirus than a human one, but we don't know what animal yet.â
Dr. John Mackenzie of the University of Queensland in Brisbane, Australia
said it seems probable at this stage that the microbe's origin is an unknown
rodent virus. The most dangerous coronavirus known is the mouse hepatitis
virus, he said, though it is unlikely, based on the genetic evidence, that
SARS is caused by a variant of that particular microbe.
Mackenzie said Chinese health authorities were less than forthcoming until
the third day of the WHO team's visit, when they became "totally frank,â
and
the scale of China's epidemic began to emerge. To date China has reported 806
cases, with 34 deaths.
WHO officials said that the Chinese federal government's Ministry of Health
has little control over disease reporting, as surveillance and most public
health activities are carried out at the provincial level. Last week China
mandated that SARS cases must now be reported to federal authorities.
"I think the Chinese should have come clean earlier,â Mackenzie said.
But he
conceded local health officials had an understandably difficult time
realizing the scale of the threat in November and December, when influenza
was spreading simultaneously, "and the waters were muddied.â By January, it
was clear that something unusual was afoot, and China should have alerted
international health authorities, he said.
"Certainly something major went on in Guangdong â the site of China's
outbreak, Mackenzie said. "Most of the pneumonia cases weren't in children or
the elderly, which is what you would see if it was flu ... And most of the
deaths were in young, healthy adults.â
WHO said Tuesday the cumulative total of cases reached 1,804 worldwide, with
62 deaths. Sixty-nine of those cases are in the United States, 10 of them in
New York. There have been no SARS deaths in the United States.
++++++++++++++++++++++++++++++++++
Phil M
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