( CNN ) -- An outbreak of the deadly ebola virus in the Democratic Republic of Congo has prompted neighboring Angola to close its border with that country , Angola 's state news agency reported Tuesday . Angolan Health Minister Jose Van-Dunem announced the `` suspension of migratory movements '' at the country 's north-eastern border Sunday , the Angop news agency reported . The World Health Organization reports 41 suspected cases of the deadly fever in Congo since November 27 . Thirteen people have died , and 183 cases are under observation . Two people are being held in quarantine . The handling of dead monkeys may be the source of the outbreak , the WHO suspects , according to Angop . Diosdado Nsue-Micawg , the WHO representative in the Angolan capital of Luanda , said the health agency does not know the source of the virus , but fears that hunters and women who visit the forest might have been in contact with infected monkeys . The outbreak is centered in the western Kassi province of the Democratic Republic of Congo , which has been reporting intermittent cases of the disease since 1976 , according to Angop .
Angola has reported intermittent cases of ebola since Nov. 27 . World Health Organization reports 41 suspected cases , 41 deaths , since 1976 . As a result of the outbreak , neighboring Democratic Republic of Congo has closed its northeastern border .