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Effects of prophylaxis with oseltamivir on influenza virus infection and disease rates among nursing home patients. The effects of both postexposure and continuous prophylaxis strategies are shown for different proportions of resistant virus strains in the community and compared with a control setting without prophylaxis and resistance. Panels A and C, postexposure prophylaxis given to all patients; panel B and D, continuous prophylaxis for 8 weeks. BL, baseline.
