Source / episode info
- **Episode:**7
- **Title:**Divine Intervention Episode 7-Viral Cases C and Fungal Cases.
- **Published:**2018-03-18
- Source:Episode page
One-liner
This episode covers key viral associations (Hepatitis A-E serology; Parvovirus B19); high-yield endemic mycoses (Histoplasma, Coccidioides, Blastomyces); and critical differentiation of opportunistic fungal infections including Aspergillus, Candida, Cryptococcus, and Mucormycosis.
High-yield summary
- Hepatitis E: Transmitted via fecal-oral route, lacks an envelope, causes acute infection (does not cause chronic), and is highly virulent in pregnant women.
- Parvovirus B19: Causes "slapped cheek" rash; congenital infection leads to severe fetal anemia/hydrops fetalis due to tropism for erythroid progenitors.
- Endemic Mycoses: The triad of pulmonary symptoms, erythema nodosum (painful red lesions on lower extremities), and arthritis strongly suggests Coccidioides immitis (Southwestern US).
- Fungal Differentiation: Aspergillus species are characterized by septate hyphae at 45° angles; Mucormycosis is defined by non-septate, wide-angle (90°) black/false membrane plaques.
- Opportunistic Infections: In HIV patients, PCP pneumonia requires a CD4 count < 200 cells/mm³ for prophylaxis and diagnosis; Cryptococcus meningitis is the most common cause of meningitis in AIDS patients.
Learning objectives
- Differentiate the transmission routes and clinical risks associated with Hepatitis A, B, C, D, and E viruses.
- Identify the characteristic skin findings and geographic associations of endemic mycoses (Histoplasma, Coccidioides, Blastomyces).
- Correlate fungal morphology (hyphal angles, septation) with specific pathogens (Aspergillus vs. Mucorales).
- Apply knowledge of CD4 count thresholds to determine prophylactic and treatment regimens for opportunistic infections (PCP, Cryptococcus).
- Distinguish the clinical presentation and causative organisms of common superficial/mucosal mycoses (Candida, Malassezia, Tinea spp.).
Board exam buzzwords