RT Book, Section A1 Stover, Natividad P. A1 Lyons, Kelly E. A2 Watts, Ray L. A2 Standaert, David G. A2 Obeso, Jose A. SR Print(0) ID 55797315 T1 Chapter 23. Infectious, Postinfectious, Toxin-Induced, and Drug-Induced Parkinsonism T2 Movement Disorders, 3e YR 2012 FD 2012 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-161312-5 LK neurology.mhmedical.com/content.aspx?aid=55797315 RD 2024/10/12 AB Parkinsonism is defined by the presence of the cardinal symptoms of bradykinesia, rigidity, tremor, and postural instability. The most common cause of parkinsonism is idiopathic Parkinson's disease (PD) but a number of cases are due to secondary parkinsonism for which there are multiple causes. This chapter will review parkinsonism resulting from infectious causes1 and exposure to various toxins and drugs.2