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Hantavirus — Complete Review
1. Virology & Classification
| Feature | Detail |
|---|---|
| Family | Hantaviridae (formerly Bunyaviridae) |
| Type | Negative-sense, single-stranded RNA, enveloped, helical |
| Genome | Tripartite (S, M, L segments) |
| Transmission | Non-arthropod-borne zoonosis — unique among bunyaviruses |
| Notable | Only bunyavirus transmitted WITHOUT an arthropod vector |
- Sherris & Ryan's Medical Microbiology, 8th Ed.
2. Clinically Important Strains
Old World (Hemorrhagic Fever with Renal Syndrome — HFRS)
| Virus | Region | Host Rodent | Severity |
|---|---|---|---|
| Hantaan | Eastern Asia (China, Korea, Russia) | Apodemus spp. | Severe (CFR 5–15%) |
| Dobrava | Balkans, Eastern Europe | Apodemus flavicollis | Severe |
| Seoul | Worldwide (Norway rats) | Rattus norvegicus | Moderate |
| Puumala | Scandinavia, W. Europe | Bank vole | Mild–moderate |
| Saaremaa | Central Europe | Apodemus agrarius | Mild |
New World (Hantavirus Pulmonary Syndrome — HPS / HCPS)
| Virus | Region | Host Rodent | CFR |
|---|---|---|---|
| Sin Nombre | Western/Central USA | Deer mouse (P. maniculatus) | 30–40% |
| Andes | Argentina, Chile | Oligoryzomys longicaudatus | ~25–35% |
| Bayou | Louisiana, Texas | Rice rat (Oryzomys palustris) | Moderate |
| Black Creek Canal | Florida | Cotton rat (Sigmodon hispidus) | Moderate |
| New York / Monongahela | Eastern USA | White-footed mouse (P. leucopus) | Lower |
| Choclo | Panama | Oligoryzomys costaricensis | — |
Key fact: Andes virus is the ONLY hantavirus with confirmed person-to-person transmission (reported in Chile/Argentina). All others transmit exclusively from rodent to human.
- Red Book 2021; Sherris & Ryan's 8th Ed.
3. Epidemiology & Transmission
Routes of human infection:
- Inhalation of aerosolized rodent urine, feces, or saliva (primary route)
- Direct contact with infected rodents or their excreta
- Rodent bite (rare)
- Contamination of broken skin
High-risk activities:
- Cleaning/entering closed, rodent-infested structures
- Agricultural work (hand plowing, harvesting)
- Camping/backpacking in rodent-infested areas (e.g., 2012 Yosemite National Park outbreak)
- Livestock/feed storage work
USA epidemiology: ~20–40 HPS cases/year; >95% west of Mississippi River; >800 total cases since 1993; 32 states affected. Disproportionate burden in American Indian/Alaska Native populations (CFR 46% vs. general population).
- Red Book 2021
4. Pathophysiology
The central mechanism is increased vascular permeability via functional impairment of vascular endothelium:
- Hantavirus infects capillary endothelial cells (detected by immunohistochemistry in lungs, heart, spleen, lymph nodes)
- CD8+ T-cell immune response → cytokine storm → capillary leak
- HPS: Pulmonary capillary leak → noncardiogenic pulmonary edema; also severe myocardial depression with low cardiac output (distinct from septic shock)
- HFRS: Vascular leak in kidneys + hemorrhagic manifestations → acute renal failure
- Jawetz Medical Microbiology, 28th Ed.; Murray & Nadel's Respiratory Medicine
5. Clinical Syndromes
5A. Hantavirus Pulmonary Syndrome (HPS / HCPS)
Incubation period: 1–6 weeks (typical 2–3 weeks)
Phase 1 — Prodromal (3–7 days)
- Fever, chills, severe myalgias, headache
- Nausea, vomiting, diarrhea, dizziness
- Absence of cough (distinguishing feature early)
- Abdominal pain common
Phase 2 — Cardiopulmonary (hours to days after prodrome)
- Abrupt onset of nonproductive cough + dyspnea → rapid respiratory failure
- Noncardiogenic pulmonary edema
- Bilateral interstitial/alveolar infiltrates + pleural effusions
- Severe hypoxemia requiring mechanical ventilation
- Myocardial depression: ↓ cardiac index, ↓ stroke volume, ↑ systemic vascular resistance, normal pulmonary wedge pressure
- Hypotension, tachycardia, lactic acidosis, metabolic acidosis
Poor prognostic indicators:
- Persistent hypotension
- Marked hemoconcentration
- Cardiac index < 2 L/min/m²
- Serum lactate > 4 mmol/L (36 mg/dL)
- Abrupt lactic acidosis onset
Mortality: 30–40% (initially ~60% in 1993 outbreak, improved with aggressive ICU care)
- Red Book 2021; Murray & Nadel's Respiratory Medicine
5B. Hemorrhagic Fever with Renal Syndrome (HFRS)
Incubation: 1–2 weeks (up to 8 weeks)
Classic 5 clinical phases (particularly Hantaan/Dobrava):
| Phase | Duration | Features |
|---|---|---|
| Febrile | 3–7 days | Fever, headache, back/abdominal pain, facial flushing, conjunctival injection, petechiae |
| Hypotensive | Hours–2 days | Hypotension, shock, vascular leakage |
| Oliguric | 3–7 days | Acute renal failure, hypertension, fluid overload, hemorrhage |
| Diuretic | Days–weeks | Massive diuresis, electrolyte imbalances |
| Convalescent | Weeks–months | Gradual recovery |
Severity by strain: Hantaan/Dobrava (severe, CFR 5–15%) > Seoul/Puumala (moderate–mild, CFR <1%)
- Sherris & Ryan's Medical Microbiology, 8th Ed.
6. Laboratory Findings
Characteristic Blood Picture (HPS)
The 5-point peripheral blood screen (positive predictive value >90% if 4/5 met):
- Hemoglobin elevated for age/sex (hemoconcentration)
- Left shift of granulocytic series
- Absence of toxic changes
- Thrombocytopenia
- Immunoblasts/plasma cells >10% of lymphocytes (basophilic cytoplasm, prominent nucleoli)
Additional labs:
- Neutrophilic leukocytosis with immature granulocytes
- Mildly elevated LFTs
- Elevated hematocrit
- Decreased serum bicarbonate
- Mild acute kidney injury (HPS); severe renal failure (HFRS)
Diagnosis (Confirmatory)
| Test | Notes |
|---|---|
| Serology (IgM + IgG) | Method of choice; IgM + IgG usually positive at symptom onset; IgG may be negative in rapidly fatal cases |
| RT-PCR (viral RNA) | Detectable in blood first 10 days; in peripheral blood mononuclear cells |
| Immunohistochemistry | Capillary endothelial cells — useful at autopsy |
| Viral culture | NOT useful (slow, requires BSL-3/4 containment) |
Commercial labs offer Hantavirus serology, but IgM positives are referred to CDC Viral Special Pathogens Branch for confirmation. Clinicians can call 470-312-0094 for assistance.
- Red Book 2021; Murray & Nadel's Respiratory Medicine
7. Management
7A. General Approach
All patients with suspected HPS should be immediately transferred to a tertiary care/ICU facility.
| Priority | Action |
|---|---|
| Airway | Early intubation if deteriorating oxygenation |
| Circulation | Inotropes/vasopressors for myocardial depression |
| Fluids | Careful fluid management — maintain perfusion WITHOUT exacerbating pulmonary edema |
| ECMO | Consider early when pulmonary wedge pressure and cardiac indices have deteriorated |
7B. Respiratory Support
- Mechanical ventilation usually required for only 2–4 days in survivors
- Recovery heralded by onset of diuresis (watch for this)
- Low-tidal volume ventilation (lung-protective) principles apply
- ECMO has been successful in severe cases and should be considered early (Harrison's 22E; Red Book 2021)
7C. Hemodynamic Support
- Vasopressors/inotropes for cardiovascular collapse
- High-dose methylprednisolone — randomized trial showed NO benefit in HPS
- Cytokine-blocking agents — theoretical role, not systematically evaluated
7D. Antimicrobials
- Broad-spectrum antibiotics are commonly administered while awaiting confirmatory diagnosis (bacterial septic shock is far more common)
- No specific antimicrobial therapy proven effective for HPS
- Red Book 2021
7E. HFRS-Specific Supportive Care
- Fluid and electrolyte balance
- Dialysis if required for fluid overload/renal failure
- Close monitoring of diuretic phase (electrolyte losses)
8. Antiviral Drug Therapy — Ribavirin
Ribavirin in HFRS ✅ (Benefit shown)
IV Ribavirin Protocol (HFRS — China RCT, 242 patients):
| Phase | Dose | Duration |
|---|---|---|
| Loading dose | 33 mg/kg IV (single dose) | Day 1 |
| Maintenance 1 | 16 mg/kg IV every 6 hours | Days 1–4 (4 days) |
| Maintenance 2 | 8 mg/kg IV every 8 hours | Days 5–7 (3 days) |
| Total duration | 7 days |
Outcome: Mortality reduced 7-fold among ribavirin-treated HFRS patients.
Key requirement: Must be initiated EARLY in the course of infection for benefit.
One open-label Russian trial showed insufficient efficacy for Puumala-caused HFRS — benefit may be strain-dependent.
Ribavirin in HPS ❌ (No proven benefit)
- Ribavirin is active in vitro against hantaviruses including Sin Nombre virus
- Two clinical trials (1 open-label + 1 randomized double-blind placebo-controlled) showed NO survival benefit in the cardiopulmonary phase of HPS
- Ribavirin is NOT the standard of care for HPS
- Animal models (hamsters, Andes virus) showed protection — but this did not translate to human HPS trials
- Red Book 2021; Murray & Nadel's Respiratory Medicine; PMC7594967
Summary Table
| Syndrome | Ribavirin Use | Evidence |
|---|---|---|
| HFRS | Recommended if early | RCT positive (China); 7-fold mortality reduction |
| HPS (cardiopulmonary stage) | NOT recommended | Two RCTs/trials: no benefit |
9. Isolation Precautions
- Standard precautions for hospitalized HPS patients (USA)
- Contact + Droplet precautions for Andes virus infection (person-to-person transmission possible)
- HPS and nonpulmonary hantavirus infections are nationally notifiable diseases in the USA (reportable to state/local public health)
10. Prevention & Control
| Measure | Details |
|---|---|
| Rodent control | Primary prevention — reduce rodent density near homes/work |
| Safe cleaning | Wet mop/spray rodent droppings with disinfectant before disturbing; avoid dry sweeping |
| Ventilate enclosed spaces | Open windows/doors 30 min before cleaning rodent-infested areas |
| PPE | N95 mask, gloves when cleaning infested areas |
| Camping precautions | Do not sleep on bare ground; use tents with floors |
| Surveillance | Avoid areas with unusually high rodent populations |
| Vaccine | No approved vaccine currently available (Old World vaccines used in China/Korea, experimental only elsewhere) |
11. Quick Comparison: HPS vs HFRS
| Feature | HPS (New World) | HFRS (Old World) |
|---|---|---|
| Main viruses | Sin Nombre, Andes | Hantaan, Dobrava, Seoul, Puumala |
| Geographic region | Americas | Asia, Europe |
| Primary organ involved | Lungs | Kidneys |
| Hemorrhage | Absent | Present |
| Renal failure | Mild/absent | Prominent |
| Person-to-person | Only Andes virus | No |
| Mortality | 30–40% (severe) | 5–15% (Hantaan); <1% (Seoul/Puumala) |
| Ribavirin benefit | No | Yes (if early) |
| Diagnosis | IgM/IgG + RT-PCR | IgM/IgG + RT-PCR |
Sources
- Harrison's Principles of Internal Medicine, 22nd Ed. (2025) — McGraw Hill
- Red Book 2021: Report of the Committee on Infectious Diseases — AAP
- Sherris & Ryan's Medical Microbiology, 8th Ed.
- Jawetz, Melnick & Adelberg's Medical Microbiology, 28th Ed.
- Murray & Nadel's Textbook of Respiratory Medicine
- Tintinalli's Emergency Medicine: A Comprehensive Study
- Huggins JW et al. — IV Ribavirin RCT in HFRS (China, 242 patients), PMC7594967
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