Describe the mode of infection and clinical manifestation of cryptococcosis. Discuss the role of the rapid diagnostic test in comparison to conventional techniques for identifying the infection.
Mode of Infection:
Cryptococcosis is caused by Cryptococcus neoformans or Cryptococcus gattii, acquired primarily via inhalation of fungal spores or desiccated yeast cells from the environment, often associated with bird droppings or decaying wood. It is not transmitted person-to-person.
Clinical Manifestations:
Pulmonary: Mild cough, fever, chest pain, nodules or infiltrates; may disseminate.
Cryptococcal Meningitis: Common in immunocompromised patients; headache, fever, neck stiffness, altered mental status, nausea, vomiting, photophobia.
Cutaneous: Papules, nodules, ulcers, often from dissemination.
Disseminated: Multi-organ involvement in severely immunocompromised individuals.
Rapid Diagnostic Test vs. Conventional Techniques:
RDT (CrAg LFA): Detects cryptococcal antigen in serum, CSF, or urine within minutes; highly sensitive, easy, and suitable for early diagnosis and screening, especially in HIV patients.
Conventional: India ink microscopy, culture (gold standard), biopsy; slower but confirmatory.
Comparison: RDT enables timely diagnosis and early treatment, reducing mortality, while culture confirms infection and drug susceptibility.
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Sakshi Negi
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