Health officials in the United Kingdom and Hong Kong, fearing that the outbreak of the deadly Ebola virus in West Africa could go global, are quarantining airline passengers from the region who have shown symptoms of the disease.
The outbreak -- the largest in history -- has spread across Guinea, Liberia, Nigeria and Sierra Leone and killed at least 672 people, according to the World Health Organization. The disease has no vaccine and no specific treatment. It has a fatality rate of at least 60%.
Global authorities on alert over Ebola outbreak
Kim Hjelmgaard and Doug Stanglin