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Alerta Nilo: La Junta suma más pueblos en zona de riesgo
West Nile Virus Alert in Andalusia: What You Need to Know
The Current Situation
About 20 towns in Andalusia are on alert because of the West Nile Virus. The virus has spread more than usual this year. The biggest problem is in Seville province, especially towns along the Guadalquivir River valley — from Constantina in the north down to La Puebla and Coria in the south.
ALERT AREAS
- Seville province: Highest concentration (Guadalquivir River valley)
- Jaén province: Alert points detected
- Granada province: Alert points detected
- Málaga province: Alert points detected
By the Numbers: Recent Years
| Year | Deaths | Infections | Notes |
|---|---|---|---|
| 2020–2023 | 12 total | — | Cumulative since 2020 |
| 2024 | 11 | 118 | Worst year on record |
| 2025 | 0 | 5 | Strict measures worked! |
GOOD NEWS: After 2024’s severe outbreak, authorities strengthened prevention measures. In 2025, zero deaths and only 5 infections were reported. Prevention works!
How to Protect Yourself: Simple Steps
Experts recommend these easy actions if you live in alert areas:
Personal Protection
- Use insect repellent — Apply on exposed skin and clothing
- Wear light-colored, long clothing — Long sleeves and long pants, even in summer
- Skip strong perfumes and scented soaps — Sweet smells attract mosquitoes
- Be extra careful at dawn and dusk — Mosquitoes are most active then
Around Your Home & Garden
- Remove standing water — Empty flowerpot saucers, buckets, old tires
- Maintain pools properly — Don’t let water sit untreated
- Cover water tanks and barrels — Use tight-fitting lids or mesh
- Clean gutters — Clogged gutters hold water where mosquitoes breed
What Authorities Are Doing
Seville Provincial Council’s Aerial Operation
Started this Wednesday: Targeted aerial spraying to control adult mosquitoes that can transmit the virus.
How it works:
- Ultra-low volume spraying — Tiny amounts, fast-acting, low environmental impact
- Guided by science — Flights triggered by daily mosquito trap data from surveillance networks
- Focused on hotspots — Rice fields with high mosquito numbers or confirmed virus circulation
- Safety buffer — 1.5 km (about 1 mile) around towns: Isla Mayor, La Puebla del Río, Los Palacios y Villafranca, and Utrera
SCIENCE-BASED APPROACH
- Spraying only happens when surveillance detects critical mosquito densities
- Treatments continue earlier larvicide work (killing mosquito babies in wetlands)
- Goal: Maximum protection with minimum chemical use
Ongoing Monitoring & Research
- Entomological surveillance network — Daily mosquito trapping and testing
- Doñana Biological Station — Studying:
- How the virus is spreading geographically
- Whether mosquitoes are developing resistance to insecticides (genes that make bug sprays less effective)
Why Community Action Matters
YOUR ROLE IS CRUCIAL
Public spraying only treats public areas. Private gardens, patios, and yards can be mosquito nurseries. Eliminating standing water on your property directly reduces the mosquito population in your neighborhood.
Simple weekly habit: Walk your property every 7 days and dump/cover anything holding water.
Summary
- ~20 Andalusian towns on West Nile Virus alert, centered on Seville’s Guadalquivir valley
- 2024 was the worst year (11 deaths, 118 cases), but 2025 measures cut deaths to zero
- Protection is simple: Repellent, long light clothing, no strong scents, remove standing water
- Authorities use smart, targeted spraying guided by real-time mosquito surveillance
- Scientists watch for insecticide resistance to stay ahead of the problem
- Prevention + community action = best defense
FAQ
What is West Nile Virus?
A virus spread by mosquito bites. Most people (80%) get no symptoms. About 20% get fever, headache, body aches. Less than 1% develop serious nervous system illness (encephalitis/meningitis), which can be fatal — especially for older adults or those with health conditions.
Which mosquitoes carry it?
Primarily Culex mosquitoes (common house mosquitoes). They bite from dusk to dawn and breed in standing water — even small amounts like a bottle cap.
Is aerial spraying safe for people and pets?
Yes. Ultra-low volume means tiny droplets (microscopic amounts) that break down quickly. Authorities spray at night when bees aren’t flying. Stay indoors during spraying as a precaution, but no special cleanup is needed afterward.
Can I get West Nile Virus from another person?
No. It doesn’t spread person-to-person (except extremely rarely through blood transfusion, organ transplant, or mother-to-baby during pregnancy). You only get it from an infected mosquito bite.
What should I do if I think I have symptoms?
See a doctor, especially if you have high fever, severe headache, stiff neck, confusion, or muscle weakness — and mention you’re in an alert area. Early medical care improves outcomes for serious cases.
