9 ene 1990 año - 1990: Cases reported in Gongola and Borno states. - d'Anambra - 54 cases, 49 deaths - Bauchi - 1 case - Bendel - 50 cases, 30 deaths - Borno - 272 cases, 25 deaths - Cross River - 10 cases - Gongola - 3, 166 cases, 48 deaths - Kaduna - 13 cases, 1 death - Kano - 366 cases, 64 deaths - Sokoto