Linz, August 4, 2026

In Linz, at least 14 people have been treated in intensive care units at the Kepler University Hospital following a cluster of Legionella infections, while the authorities of the state of Upper Austria and the Agency for Health and Food Safety (AGES) search for the source of the outbreak.

According to the authorities, the wave of infection is closely linked to the ongoing heatwave, which has warmed the water in pipes and systems more than usual. Warm, stagnant water provides ideal conditions for Legionella to multiply. Samples have been taken in several districts of Linz to identify the exact source.

Transmission and Route of Infection

An infection occurs exclusively when the finest water droplets are inhaled – for example, when showering or via aerosols from whirlpools, humidifiers, or certain air conditioning systems. This explanation was passed on by the responsible authorities in Upper Austria as central information for the population.