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West Nile Virus Not Circulating in Andalusia Due to Rain and Mild Temperatures

The Minister of Health reports no detected cases in humans, birds, or equines, attributing the situation to weather conditions.

Close-up of mosquito traps in a marshy area at dusk, with warm, diffused light. Blurred green vegetation in the background.
IA

Close-up of mosquito traps in a marshy area at dusk, with warm, diffused light. Blurred green vegetation in the background.

Minister of Health, Antonio Sanz, confirmed that the West Nile Virus (WNV) has not shown circulation in Andalusia to date, an unusual situation attributed to recent rains and moderate temperatures.

The West Nile Virus (WNV) Surveillance and Control Program in Andalusia, launched on May 1st, has not detected virus circulation in the autonomous community so far. The acting Minister of Health, Presidency, and Emergencies, Antonio Sanz, announced this from the Advanced Command Post in Sanlúcar de Barrameda. No human cases of West Nile Fever (WNF) have been reported this year, nor have any cases been detected in wild birds or equines.
According to experts, this situation, considered anomalous for the time of year, could be explained by recent rainfall and mild temperatures. Despite the absence of active viral circulation, moderate increases in mosquito densities have been recorded in some municipalities across four provinces. Locations such as Fuente de Piedra (Málaga), Villamanrique de la Condesa (Seville), Sanlúcar de Barrameda (Cádiz), and Motril (Granada) have shown densities exceeding 100 or 200 transmitter female mosquitoes in their traps. These figures are expected to increase progressively with rising temperatures.
Entomological surveillance, using mosquito trapping, began on May 4th with 27 traps in Cádiz and Seville, and will be expanded to a total of 120 planned traps throughout the community. These are supplemented by traps from the Provincial Council of Huelva and those from the Guadalquivir Mosquito Observatory (Doñana Biological Station-CSIC).
The program also includes surveillance for neuroinvasive syndromes and mild human cases. To date, laboratory studies have been conducted on 125 patients, including 47 with viral meningitis, ruling out WNV in all instances. In animal surveillance, 95 wild birds have been analyzed without detecting any positive WNV cases, nor have any positive cases been found in equines.
The minister advised citizens, especially pilgrims, to take protective measures against mosquito and tick bites, such as using repellent, wearing appropriate clothing, and avoiding contact with vegetation, to ensure a safer pilgrimage.
Public Health has communicated risk levels to municipalities, and inspectors have provided technical advice on surveillance and control measures, conducting 469 verifications in 120 municipalities. Local Project Teams have delivered 49 training sessions to 2,125 individuals, including activities in schools and community outreach.
The Directorate General of Public Health and Pharmaceutical Planning maintains this comprehensive surveillance program under the ‘One Health’ approach, in response to the epidemiological evolution observed in Andalusia in recent years.

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