Health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in MonroviaThe World Health Organization (WHO) is asking countries affected by Ebola to conduct exit screenings of people leaving at international airports, seaports and major land crossings. “Any person with an illness consistent with [the Ebola virus] should not be allowed to travel unless the travel is part of an appropriate medical evacuation. There should be no international travel of Ebola contacts or cases, unless the travel is part of an appropriate medical evacuation,” the WHO said in a statement. The West Africa outbreak has spread to Guinea, Liberia, Nigeria and Sierra Leone. The announcement comes after a quarantine center was attacked in Liberia on Saturday. Reports suggest that around 17 Ebola-positive patients were taken from the center, which complicates efforts to track down and isolate people who may have come in contact with the disease. Blood-stained bedding was also stolen from the center, which officials warned may be able to spread the disease. The WHO has created a Travel and Transport Task Force which will continuously monitor the outbreak in order to provide information and advice to the travel and tourism industry, but is currently not recommending any bans on international travel or trade. The WHO is also not recommending entrance screening for countries not affected by the disease and which do not share borders with affected countries. The WHO also stressed that transmission of the virus on an airplane is a very low risk. MORE