a1 Regional Public Health and Virus Laboratory, East Birmingham Hospital
a2 Department of Infectious Diseases, Coppetts Wood Hospital, London
a3 Royal Veterinary College, London
We have assessed the effectiveness of flexible-film negative-pressure isolators by physical and biological means. We have found that they afford a high degree of containment and therefore also of safety to hospital staff. We offer some recommendations on the operation of these isolators to ensure the optimum degree of protection.
(Received February 02 1978)