Sorry Lala, I can't help you much. I don't know much about reactive arthritis. But Ides is an expert in the spondylitis stuff. I'm sure you'll find some information in the links Ides has provided. Hope your cousin feels better.
Current dx: Rheumatoid Arthritis
Suspected dx: Early Lupus/MCTD; Inflammatory Bowel Disease
Current Meds: Enbrel, Plaquenil, Aciphex, Ultracet, Zyrtec, Allavert-D, Zantac, Tylenol PM
Past Meds: Relafen, Vioxx, Mobic, Voltaren, Sulfasalazine, Entocort, Prednisone, Humira, Reglan