Observations were made on patients in a new type of subdivided hospital ward with controlled ventilation and in two older open-plan wards with natural ventilation.

The rate of acquisition in the nose of new strains of was somewhat lower in the new ward than in the old wards, but the advantage was restricted to patients who stayed 2 wk or less, and there was no corresponding reduction in the rate of acquisition of tetracycline-resistant staphylococci or in the proportion of patients who became carriers of resistant strains.

No evidence was obtained that the risk of post-operative wound sepsis, or of acquired sepsis due to , was less in the new ward than in the old wards.


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