hospital infection

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Hand-washing is an important weapon in the fight against hospital infections.

hospital infection

/ ˈhɒspᵻtəl ɪnˈfɛkʃən / noun

an infection that someone gets while staying in a hospital, for example from other patients or staff or from the environment:
Hospital infections such as MRSA are now on the decline after several high-profile hygiene campaigns.

Hospital infections are also called hospital-acquired infections or HAIs:
Many HAIs are completely preventable.