July 11, 2012
STORY HIGHLIGHTS
- Doctors say the inappropriate use of steroids worsened many cases
- No new cases of the condition have been confirmed since last Saturday
- The pathogens include enterovirus 71, streptococcus suis and dengue
- Most of the patients have come from southern Cambodia
The pathogens include
enterovirus 71, streptococcus suis and dengue, the medical sources said.
Additionally, the inappropriate use of steroids, which can suppress the
immune system, worsened the illness in a majority of the patients, they
said.
The sources did not want
to be identified because the results of the health organization's
investigation have not yet been made public.
Dr. Beat Richner, head of
Kantha Bopha Children's Hospitals -- which cared for 66 patients
affected by the illness, 64 of whom died -- said that no new cases had
been confirmed since last Saturday.
The World Health
Organization (WHO) is also expected to advise health care workers to
refrain from using steroids in patients with signs and symptoms of the
infection, which include severe fever, encephalitis, and breathing
difficulties.
Over the past four
months, doctors at Kantha Bopha in Phnom Penh have been faced with the
mysterious syndrome, which kills children so fast that nearly all of
those infected with it die within a day or two of being admitted to the
hospital.
In the last hours of their life, the children experienced a "total destruction of the alveola(e) in the lungs," Richner said.
Other hospitals in the
country have also reported similar cases, but far fewer than the
children's hospital in the capital, which is the most popular.
Most of the children who
have contracted the illness have come from the south of the country,
though health officials cannot find what is known as a cluster -- a lot
of cases coming from one specific area.
By June 29, the WHO had
been contacted and Cambodian officials were scrambling to instruct
health providers across the country to spread the message to the masses
as quickly as possible.
The WHO and the
Cambodian authorities' announcement of the situation drew criticism from
Richner, the head of the children's hospital, that they were "causing
unnecessary panic."
The WHO said the unexplained nature of the outbreak obliged it to communicate the information.
Over the weekend, lab
tests linked enterovirus 71 (EV71), which is known to cause neurological
disease, to some of the cases. But it didn't solve the whole puzzle and
health officials continued their investigations, noting the detection
of other elements like streptococcus suis and dengue.
The rainy season in
Cambodia, which lasts from May to October, is a key problem in trying to
control diseases like dengue, which are transmitted by mosquitoes.
Because of a lack of indoor plumbing in many homes, people collect rainwater in vats, potential breeding grounds for mosquitoes.
Streptococcus suis is a
pathogen that can cause infections like bacterial meningitis in people
who are in close contact with pigs or pork-products. Reported cases of
it have risen significantly in recent years, notably in Southeast Asia,
according to a paper that appeared last year in Emerging Infectious Diseases, a journal published by the Centers for Disease Control and Prevention (CDC) in Atlanta.
The link to EV71 does
not particularly help in the treatment of the illness, as there is no
effective antiviral treatment for severe EV71 infections, and no vaccine
is available.
In milder cases, EV71
can cause coldlike symptoms, diarrhea and sores on the hands, feet and
mouth, according to the journal Genetic Vaccines and Therapy. But more
severe cases can cause fluid to accumulate on the brain, resulting in
polio-like paralysis and death.
Outbreaks of the
enterovirus "occur periodically in the Asia-Pacific region," according
to the CDC. Brunei had its first major outbreak in 2006. China had an
outbreak in 2008.
Adults' well-developed immune systems usually can fend off the virus, but children are vulnerable to it, according to the CDC.
In Cambodia, as with
many places around the world, parents first try treating their child at
home. If that doesn't work then they go to their local clinic, with a
trip to the nearest hospital the last resort as it often involves a long
trip.
CNN's Sara Sidner and Tim Schwarz contributed to this report.
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