Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

  • Listen to MedLink on the go with Audio versions of each article.

Three-dimensional representation of Neisseria pili

Three-dimensional computer-generated image of Neisseria diplococcal bacteria. Extending from the organisms’ exterior are type IV pili, or hair-like appendages, which improve surface adherence. The artistic recreation was based on scanning electron microscopic imagery. Image by Alissa Eckert, Medical Illustrator, for the Antibiotic Resistance Coordination and Strategy Unit, Centers for Disease Control and Prevention, 2013. (Courtesy of the Public Health Image Library, Centers for Disease Control and Prevention.)

Associated Disorders

  • asplenia
  • deficiency of a terminal complement component (C5-9)
  • deficiency of properdin