peace core is evacuated 340 volunteers, from sarah lyon, and liberia.eria where one by lear vinnie man has known to have died of the is he stkao*ez, authoritiedisease.authorities ao deal with the disease, they are screening suspected cases in the airport. >> we are insuring that passengers that are boarding those flights tar ebola free. we are also insuring that as soon as those passengers are ready to take off, we also have lists of the manifests, which we look at. and also we have professionals on the grounds who look at the passengers especially from areas that ebola effected. >> reporter: an out break in nigeria would have a huge i believe pack not just in the country but across the region. the authorities here hope such measures will help to stop the virus spreading in nigeria. but any fear any major out break will find a way in through the porous land and seaboarders. it's spread through close contact with those affected he especially through bodily fluids some say dietary condition is affecting. complete isolation is also add to this problem. >>

south africa has and noncitizens traveling from guinea, liberia, and sarah lyons.the hardest hit has been liberia where at least 576 people have died. on wednesday, police opened fire on protesters in the west point neighborhood of liberia's capital city monrovia after they quarantined residents without any notice in an effort to stop the spread of ebola. a 15-year-old boy was shot in the lead. residence at the protest was sparked by the police's heavy-handed presence in the quarantine area. this is a local resident. >> [indiscernible] it is bad. it is very, very bad. >> the ebola outbreak has also generated an international debate over the use of experimental drugs to treat the disease. three weeks ago, the first two doses of an experimental serum known as zmapp went to two american missionaries, dr. kent brantly and nancy writebol who had contracted the disease in liberia and returned to the united states for treatment. both were released from the emory university hospital this week. doctor confirmed they no longer pose a health risk to the public. >> i am please