The presentation, so brief as to be little more than a public service announcement, signals an abandonment of efforts to prevent emergence of a wider avian flu pandemic.

CDC officials said the study suggests asymptomatic workers who engage in jobs that put them at high risk for exposure at poultry and dairy farms might be at heightened risk. The CDC had recommended testing be limited to workers who had symptoms after ...

Following a CDC study showing bird flu exposure among dairy workers, health officials recommend increased testing and preventative measures for farmworkers, even if they show no symptoms, to prevent virus spread and mutation.