One of Portugal's largest legionellosis outbreaks, affecting 375 people and killing 12 in the Lisbon district within two weeks.
Key Facts
- Total cases
- 375
- Deaths
- 12
- Outbreak start
- 7 November 2014
- Outbreak declared extinct
- 21 November 2014
- Source
- Cooling towers of a fertilizer plant, Forte da Casa
- Primary affected areas
- Póvoa de Santa Iria, Forte da Casa, Vialonga
By the Numbers
Location
Cause → Event → Consequence
Legionella bacteria were released from the cooling towers of a fertilizer plant in Forte da Casa, Vila Franca de Xira. The aerosols spread through the surrounding urban areas, exposing residents in several municipalities of the Lisbon district to the pathogen.
Beginning on 7 November 2014, an outbreak of legionellosis spread across multiple cities in the Lisbon district, primarily affecting Póvoa de Santa Iria, Forte da Casa, and Vialonga. It resulted in 375 confirmed cases and 12 deaths before Portuguese Health Minister Paulo Macedo declared it extinct on 21 November.
The outbreak prompted a public health response led by the Portuguese Ministry of Health, culminating in its containment within approximately two weeks. It highlighted the risks posed by industrial cooling towers in populated areas and the need for stringent maintenance and monitoring protocols to prevent Legionella proliferation.