While the investigation remains ongoing, officials emphasize that the bacteria is not transmitted from person to person.
Understanding the Investigation and Health Risks
The INSP launched an epidemiological inquiry after a Metrorex staff member was hospitalized with a confirmed diagnosis of legionellosis. Public speculation initially linked the case to the recent flooding at the Piața Victoriei 2 station, which was submerged following heavy rainfall in early July. However, the INSP officially clarified that the employee had no exposure to the water involved in the station’s flooding, noting that the evacuation process was conducted exclusively by firefighters and gendarmes.
Teams from the Ilfov Public Health Directorate (DSP), the Bucharest DSP, and the Ministry of Transport’s medical department are currently working to identify the actual source of the infection. According to official data, 82 cases of legionellosis were reported in Romania throughout 2025, comprising 70 confirmed and 12 probable cases.
Legionella bacteria are naturally occurring in environments like rivers and lakes, but they thrive in artificial water systems when temperatures remain between 20°C and 45°C.
Where Legionella Bacteria Typically Thrive
Legionella bacteria require specific environmental conditions to grow, including the presence of nutrients often found in biofilms, algae, or amoebae. Sediment, rust, and sludge in water systems can create favorable habitats for the bacteria. The INSP identifies several high-risk environments where the bacteria may proliferate:
- Centralized water systems and building plumbing.
- Cooling towers and evaporative condensers.
- Industrial aeration basins and cooling machinery.
- Public or private swimming pools and thermal springs.
- Respiratory therapy equipment and dental water lines.
- Fountains, sprinklers, and food display humidifiers.
Prevention and Safety Protocols
There is currently no vaccine available for Legionella pneumonia, making environmental management the primary defense strategy. The INSP advises that the most effective way to prevent infection is to maintain strict hygiene standards for water systems and ensure water temperatures for human consumption are kept outside the 20°C–45°C growth range. Because the bacteria cannot be transmitted between humans, the focus remains entirely on monitoring and maintaining infrastructure.
Frequently Asked Questions
- Is the Piața Victoriei subway station safe?
- Yes. The INSP confirmed that the metro employee’s infection is not linked to the floodwaters at the station, which were handled by emergency services.
- How does Legionella spread?
- The bacteria are not transmitted from person to person.
- What are the symptoms of legionellosis?
- Legionellosis is a reportable disease. If you suspect exposure or are experiencing respiratory distress, consult a healthcare provider immediately.
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