Director general convenes emergency committee, saying ‘level of alarm is extremely high’ as virus has now been detected in 23 countries
The World Health Organisation has convened an emergency
committee to discuss the “explosive” spread of the Zika virus, which has been
linked to thousands of birth defects in Latin America.“Last year the disease
was detected in the Americas, where it is spreading explosively,” Margaret
Chan, the WHO director general, said at a special briefing in Geneva. It was
“deeply concerning” that the virus had now been detected in 23 countries in the
Americas, she added.One WHO scientist estimated there could be 3-4m Zika
infections in the Americas over the next year.The spread of the virus has
prompted governments across the world to advise pregnant women against going to
the areas where it has been detected. There is no vaccine or cure for Zika,
which has been linked to microcephaly, a serious condition that can cause
lifelong developmental problems.
Chan said: “The level of alarm is extremely high. Arrival of
the virus in some cases has been associated with a steep increase in the birth
of babies with abnormally small heads.”She added: “A causal relationship
between Zika virus and birth malformations and neurological syndromes has not
yet been established – this is an important point – but it is strongly
suspected.“The possible links have rapidly changed the risk profile of Zika
from a mild threat to one of alarming proportions. The increased incidence of
microcephaly is particularly alarming as it places a heartbreaking burden on
families and communities.” Chan outlined four reasons for alarm: “First, the
possible association of infection with birth malformations and neurological
syndromes. Second, the potential for further international spread given the
wide geographical distribution of the mosquito vector. Third, the lack of
population immunity in newly affected areas. Fourth, the absence of vaccines.”This
year’s El Niño weather patterns meant mosquito populations were expected to
spread, Chan added. “For all these reasons, I have decided to convene an
emergency committee under the international health regulations,” she said.
The committee will meet on Monday and will advise on the
international responses and specific measures in affected countries and
elsewhere.Brazilian authorities estimate the country could have up to 1m Zika
infections by now, and since September, the country has registered nearly 4,000
cases of babies with microcephaly.The Zika outbreak and spike in microcephaly
cases have been concentrated in the poor and underdeveloped north-east. But the
south-east, where São Paulo and Rio de Janeiro are located, is the nation’s
second hardest-hit region. Rio de Janeiro is of particular concern, since it
will host the Olympic games this summer.The president of the International
Olympic Committee, Thomas Bach, said the IOC was in “close contact” with
Brazilian authorities and the WHO, and that all national Olympic bodies would
be advised on how to deal with the virus before the Games started.
The Brazilian president, Dilma Rousseff, has pledged to wage
war against the Aedes aegypti mosquito that spreads the virus, focusing on
getting rid of the insect’s breeding grounds.City at centre of Brazil's Zika
epidemic reeling from disease's insidious effects The US Centers for Disease
Control and Prevention said there had been 31 cases of Zika infection among US
citizens who travelled to areas affected by the virus, but so far there had
been no cases of transmission of the virus through mosquitoes in the US itself.
The White House said its experts were most concerned about its potential impact
on women who are pregnant or could become pregnant.US officials said the
country had two potential candidates for a vaccine, and might begin clinical
trials in people by the end of this year. But experts in disease control have
warned they do not expect to have a vaccine available in 2016. Dr Anthony
Fauci, director of the National Institute of Allergy and Infectious Diseases,
said on Thursday that previous research into dengue fever, the West Nile virus
and the chikungunya virus would give scientists an “existing vaccine platform”
which could be used as “a jumping-off point” for finding a cure to the Zika
virus.“It is important to note that we will not have a widely available safe
and effective Zika vaccine this year and probably not in the next few years,”
Fauci said, before adding that scientists might be able to begin “a phased
clinical trial in this calendar year”.Addressing the global threat, Lawrence
Gostin, a public health law expert from Georgetown University, warned that Zika
had an “explosive pandemic potential”.Speaking to the BBC’s World Service,
Gostin, a member of a commission that criticised the WHO for its response to
Ebola, said: “With the Rio Olympics on our doorstep I can certainly see this
having a pandemic potential.”He said every review of the WHO’s response to
Ebola found that it was “too little, too late”.Interviewed minutes before
Chan’s announcement, he said: “I’m disappointed that the WHO has not been
acting proactively. They have not issued any advice about travel, about surveillance,
about mosquito control.“The very first thing I would propose is a global
mosquito eradication effort, particularly in areas with ongoing Zika
transmission. We really need to declare war on this species of mosquito.”
The WHO’s leadership admitted last April to serious missteps
in its handling of the Ebola crisis, which was focused mostly on three west
African countries and killed more than 10,000 people.Some critics have said the
WHO’s slow response played a major role in allowing the epidemic to balloon.Zika
is related to yellow fever and dengue. An estimated 80% of people that have it
have no symptoms, making it difficult for pregnant women to know whether they
have been infected.Anne Schuchat, principal deputy director of the Centers for
Disease Control and Prevention, said: “We really do expect there to be a lot
more travel-associated cases. For the average American who is not travelling
this is not something they need to worry about. For people who are pregnant and
considering travel to the affected areas, please take this seriously.”She said
living conditions in the US, including lower human density in urban areas and
access to air conditioning, meant people were at less of a risk of contracting
the virus than those living in South and Central American cities.“We don’t have
local transmission of the virus in the US right now,” added Fauci. “There’s
essentially no risk at all because we don’t have locally transmitted Zika virus
in the US.”“We believe this is a time-limited infection in women, men and
children,” said Schuchat. “People have symptoms for up to about a week, not
months and years of chronic viral infection. We know four out of five people
with this infection have no symptoms.”She added the Zika virus passed very
quickly through the bloodstream and in most cases the virus would clear from
the bloodstream within about a week.Asked when the babies of pregnant mothers
could become infected with the virus, Schuchat said the foetus was most at risk
of contracting microcephaly through Zika in the first trimester of the
pregnancy. Scientists did not yet have “sufficient knowledge to know what
effects in the second and third trimester”, she cautioned.There has been one
reported case of the Zika virus through “possible sexual transmission”, while a
second case was found in a man’s semen. However, Schuchat highlighted that
scientific research clearly showed Zika was “primarily transmitted through the
bite of an infected mosquito”.
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