Nigeria now has 18 Ebola cases, after a fourth case was found in Port Harcourt, the health minister said on Wednesday.

The Port Harcourt carrier skipped quarantine and traveled to Port Harcourt, bringing the disease there. A doctor died in the oil city last week. Health Minister Onyebuchi Chukwu said a patient he had treated had also now died.A total of 255 people were under surveillance in Port Harcourt, while 41 were in Lagos.

Meanwhile, the World Health Organization has said on Wednesday, that more than 1,900 people have died with a total of more than 3,500 people have been infected by the Ebola virus in Liberia, Guinea, Sierra Leone and Nigeria since the first documented cases in December.