A 58-year-old woman was admitted to the hospital 3 weeks after lumbar surgery because of diplopia and fever. Left leg pain and a rash had preceded the fever and diplopia. A diagnosis was made.

Peter Gratton, Ph.D., is a New Orleans-based editor and professor with over 20 years of experience in investing, risk management, and public policy. Peter began covering markets at Multex (Reuters) ...

Elvis Picardo is a regular contributor to Investopedia and has 25+ years of experience as a portfolio manager with diverse capital markets experience. Suzanne is a content marketer, writer, and ...

Modulating enzyme activity by attaching a cofactor or a protein different from the enzyme has long been used in the construction of signaling molecules for the detection and/or dosage of small organic ...