article_snippet.sent: Those affected are between the ages of 25 and 60.  
article_snippet.sent: The disease does not appear to be contagious, The disease said.
article_snippet.sent: Symptoms include headaches, blurred vision, loss of sight and unconsciousness, Adeyanju said.
article_snippet.sent: Investigators sent samples of blood, urine and spinal fluid to a university in the city of Lagos for tests, which ruled out infections from viruses or bacteria, the WHO said.
article_snippet.sent: Doctors plan to carry out toxicological tests on one of the victims who died in a hospital, WHO spokesman Tarik Jasarevic said.