These devices include shower heads, hot tubs, humidifiers, and whirlpool bathtubs. The likelihood of Legionella exposure may be reduced by good engineering practices which includes proper maintenance and operation of air and water handling systems and mist-producing devices. How are Legionella bacteria spread in indoor environments? If the droplets are small enough, they can be inhaled, and the bacteria can enter the lung. In buildings, Legionella can be spread through ventilation systems when circulated air picks up droplets of contaminated water. Warm, stagnant water can promote bacteria growth, including the growth of Legionella. In other words, aspiration occurs when instead of something going from your mouth or nose to your stomach (other than air), it enters the lungs.Įvidence of person-to-person transmission has not been found, nor is there any documentation of animal-to-person transmission. Aspiration is defined as the entry of a liquid or solid into the trachea or lower respiratory system directly though the oral or nasal cavity, or indirectly by vomiting. The normal presence of Legionella in water and soil is not automatically associated with an outbreak of the disease.Īspiration, although less common, is another way that the Legionella microbes can enter into the lungs.
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