Other West African governments are attempting to contain the outbreak , which has been declared a `` public health emergency of international concern '' by the World Health Organization . Nigeria says people who traveled to Nigeria tested negative for the virus . Canada bans travelers from Ebola countries . Guinea , Liberia and Sierra Leone and Nigeria are battling infection .
Nigeria says people who traveled to Nigeria tested negative for the virus . Canada bans travelers from Ebola countries . Guinea , Liberia and Sierra Leone and Nigeria are battling infection .