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Emergency critical care topic

Infectious Disease study guide previews.

Infectious disease previews relevant to emergency and critical care, including pneumonia, dengue, listeria, hantavirus, and streptococcal disease.

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Streptococcal Pharyngitis (Strep Throat) Basics: Comprehensive Overview

Streptococcal Pharyngitis (Strep Throat) Basics: Comprehensive Overview introduces the clinical pattern, physiology, and bedside decisions that matter for emergency and critical care practice.

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Streptococcal Pharyngitis Basics

Rhinovirus, coronavirus, adenovirus, Epstein-Barr virus (EBV), influenza, parainfluenza. Group C & G Streptococcus, Fusobacterium necrophorum (in adolescents/young adults), Mycoplasma. Small vesicles on soft palate/tonsils, mostly in children. Oral ulcers + vesicular rash on hands/feet, often in young kids. Neck stiffness, drooling, stridor, usually in children <5 years. Consider in sexually active individuals; often asymptomatic or mild sore throat. Adolescents/young adults, pharyngitis with sepsis, neck pain/swelling (IJ vein thrombosis). Chronic sore throat, especially in the morning, associated with heartburn.

Always evaluate sore throat in the context of age, exposure history, symptoms, and physical exam findings.

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Hantavirus Basics: Cases, Reservoir, Transmission, Incubation, Symptoms, Prevent

Hantaviruses are a group of ~30 related rodent‑borne viruses causing two main human syndromes: Hantavirus cardiopulmonary syndrome (HCPS/HPS) and hemorrhagic fever with renal syndrome (HFRS). Disease patterns vary by geography due to different viral species and rodent reservoirs.

U.S.: Surveillance began in 1993 (Four Corners region). Cumulative cases ~1993-2022 numbered in the hundreds, with ~35% mortality reported for HCPS; most cases occur west of the Mississippi (Southwest, West Coast, Pacific Northwest).• Europe: Annual HFRS cases often number in the low thousands, concentrated in Finland and Germany; disease phenotype differs from U.S. due to circulating species.• Media attention periodically spikes with notable cases; sporadic clusters reported in U.S.

Family includes hantaviridae (single‑stranded RNA viruses). Multiple species; Sin Nombre virus is prominent in the U.S. Southwest and strongly associated with severe HCPS.• Zoonosis: Maintained in rodents; humans are incidental hosts.• U.S. rodent reservoirs: deer mouse, white‑footed mouse, rice rat, cotton rat. Geographic ranges vary, enabling exposure risks across much of the country.

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