Re: MS Patient Dies From Anti-Drug Antibodies This attitude would have saved that patient:Conclusion: An extended ELISA method for measuring anti-natalizumab antibody titres in multiple sclerosis patients on natalizumab therapy may be used for evaluation of antibody persistence. A test at three months may identify patients with high titres, who should discontinue natalizumab therapy, and patients with transient low-titre antibodies, who may continue natalizumab therapy despite development of antibodies. http://msj.sagepub.com/content/18/10/1493