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An outbreak of acute gastroenteritis hospitalized 99 (12%) of 835 U. S. Army trainees at Fort Bliss, El Paso, Texas, from August 27 to September 1, 1998. Reverse transcriptase polymerase chain reaction tests for Norwalk-like virus were positive for genogroup 2. Gastroenteritis was associated with one post dining facility and with soft drinks.

There is a significant heterogeneity in selecting an intervention based on PAC data among intensivists. The presence of Echo information may change the intervention selected but does not reduce heterogeneity. Any randomized trial evaluating efficacy of PAC's will have to have strict treatment protocols.

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