Cryptococcus is a topic covered in the Johns Hopkins ABX Guide.

To view the entire topic, please or purchase a subscription.

Pediatrics Central™ is an all-in-one application that puts valuable medical information, via your mobile device or the web, in the hands of clinicians treating infants, children, and adolescents. Explore these free sample topics:

Pediatrics Central

-- The first section of this topic is shown below --

MICROBIOLOGY

  • Yeast-like, round fungus; usual size is 5-10µm with polysaccharide capsule [Fig].
    • Reproduces by narrow-based budding.
  • Epidemiology: worldwide in soil, high levels in pigeon droppings (but this relevance is questionable for human disease).
  • Two species:
    • C. neoformans historically divided into 4 serotypes (A to D) described based upon the capsule components with 2 species and 2 varieties causing human disease. Now based on genotypic evaluation, proposed:
      • Serotype A: now known as C. neoformans v. grubii
      • Serotypes B and C: C. gattii
      • Serotype D: C. neoformans v. neoformans (most common) and worldwide in distribution
    • C. gattii: more recently detected and seen primarily in Australia, Western Canada and northwestern U.S. (Washington and Oregon).
      • Clinical presentation and diagnosis and treatment are the same as with C. neoformans.
      • Differences from C. neoformans include higher attack rates in healthy hosts, and worse prognosis.
      • Appears more resistant to fluconazole.
      • True extent of infection/epidemiology not known.

-- To view the remaining sections of this topic, please or purchase a subscription --

Last updated: February 5, 2019