Rising Legionnaires’ Disease Cases in Europe Raise Public Health Concerns

Legionnaires’ disease, a severe form of pneumonia, is on the rise across Europe, prompting increased vigilance from public health officials. Recent data indicates a significant increase in reported cases, particularly in 2023, with specific demographics proving more vulnerable. Understanding the risks, symptoms, and preventative measures is crucial for protecting public health.

Legionnaires’ Disease: An Overview

Legionnaires’ disease is caused by Legionella bacteria, which grow in water systems and are spread through inhaling contaminated water aerosols. Common sources include showers, hot tubs, cooling towers, and plumbing systems. The disease is not spread from person to person.

Recent Trends in Europe

In 2023, the notification rate of Legionnaires’ disease increased to 3.2 cases per 100,000 population, a rise from the 2.6 cases per 100,000 reported in 2022 . This represents a notable increase in the incidence of the disease across the European Union/European Economic Area (EU/EEA). Notification rates vary significantly between countries, ranging from less than 0.5 to 6.9 cases per 100,000 population (age-standardized rate) as reported by Slovenia .

Four countries – France, Germany, Italy, and Spain – accounted for 72% of all notified cases in 2023 . The number of cases linked to travel increased by 16% in 2023 compared to 2022 .

Who is Most at Risk?

Certain populations are more susceptible to Legionnaires’ disease. In 2023, males aged 65 years and above were most affected, with a notification rate of 12.7 cases per 100,000 population, compared to 5.2 cases per 100,000 in females . Other risk factors include smoking, chronic lung disease, and weakened immune systems.

Symptoms and Diagnosis

Symptoms of Legionnaires’ disease typically appear 2 to 10 days after exposure to the bacteria and can include:

• Cough
• Shortness of breath
• Fever
• Muscle aches
• Headache

In severe cases, Legionnaires’ disease can lead to pneumonia, respiratory failure, and even death. Diagnosis involves laboratory testing of urine and/or sputum samples .

Outbreaks and Community Spread

In 2023, seven countries reported a total of 39 community- or hospital-acquired outbreaks, resulting in 368 cases . These outbreaks highlight the importance of maintaining and monitoring water systems in public and private buildings.

Prevention and Control

Preventing Legionnaires’ disease requires diligent water management practices:

• Regularly clean and disinfect water systems.
• Maintain appropriate water temperatures.
• Monitor water quality for Legionella bacteria.
• Implement control measures in cooling towers and other potential sources.

Looking Ahead

The increasing trend of Legionnaires’ disease in Europe is a cause for concern. Continued surveillance, improved water management practices, and public awareness campaigns are essential to mitigate the risk and protect public health. The causes of the recent increases remain under investigation, with factors such as changes in testing policies, an aging population, and climate change potentially playing a role .