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The outbreak that began in Guinea has turned into a cross-border crisis that could spread to more countries, the WHO said.
Despite efforts by national health authorities and international aid organizations to contain its spread, the WHO has recorded 635 infections, including 399 deaths, in Guinea, Sierra Leone and Liberia since the outbreak began in February. The number of infections continues to rise.
In response to the worsening crisis, the WHO said it will convene a special meeting of health ministers from 11 countries in Accra, Ghana, on July 2 and 3 to develop a comprehensive inter-country response plan.
Ebola — with a fatality rate of up to 90 percent, no vaccine and no known cure — has not previously occurred in the West Africa region. People there have become frightened of health facilities, blaming them for importing and spreading the virus.
The Ebola virus initially causes raging fever, headaches, muscle pain, conjunctivitis and weakness, before moving into more severe phases with vomiting, diarrhea and internal and external hemorrhaging.
"There is an urgent need to intensify response efforts; to promote cross-border collaboration and information sharing of suspected cases and contacts ... and to mobilize all sectors of the community," Sambo said. "This is the only way that the outbreak will be effectively addressed."
Medical charity Doctors Without Borders (MSF) said this week that a lack of understanding has meant people continue to prepare corpses and attend funerals of victims, leaving them vulnerable to a disease transmitted by touching victims or via bodily fluids.
MSF accused civil society groups, governments and religious authorities of failing to acknowledge the scale of the epidemic, resulting in few prominent figures promoting the fight against the disease.