Seasonal hantavirus risk levels by world region, based on rodent breeding cycles, climate patterns, and historical outbreak data.
| Region | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Americas (HPS) | Low | Low | Moderate | High | High | High | Moderate | Moderate | Moderate | Low | Low | Low |
| Europe (HFRS/PUUV) | Low | Low | Low | Low | Moderate | Moderate | High | Critical | High | Moderate | Low | Low |
| Asia (HFRS/HTNV) | Moderate | Moderate | High | High | Moderate | Moderate | Moderate | High | High | Moderate | Moderate | Moderate |
| Global (Seoul) | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
Low
Moderate
High
Critical
● = Current month🌱 Spring (Mar–May)
- •Americas: Peak HPS season — deer mice begin nesting and breeding
- •Asia: HFRS season begins as field work increases rodent contact
- •Highest-risk time to clean winter-closed cabins, garages, barns
☀️ Summer (Jun–Aug)
- •Europe: Bank vole populations peak — highest HFRS risk for Finland, Germany, Sweden
- •Americas: HPS risk remains elevated, especially in dry Western US
- •Camping and outdoor activities increase exposure risk globally
🍂 Autumn (Sep–Nov)
- •Europe: Puumala virus infections surge as voles move indoors before winter
- •Mast years (heavy nut/seed production) drive 10x normal vole populations
- •Asia: Second seasonal peak for HFRS in Eastern Asia
❄️ Winter (Dec–Feb)
- •Americas: Lowest HPS risk — deer mouse activity reduced
- •Europe: HFRS cases decline but Seoul virus risk year-round globally
- •Indoor rodent infestations increase — seal entry points before spring