In all kind of pulmonary function tests, the flow sensor, the essential and sensitive part of the measurement system, gets in touch with exhaled patient air. Exhaled air, especially at high flows which are typical during pulmonary function tests, contains small droplets or even mucus with all kind of different viruses and bacteria, from relatively harmless cold to life-threatening tuberculosis. This generates a high risk for cross-contamination between patients if no attention is paid to a proper hygiene concept.

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