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USDA is revving up its surveillance of wild bird populations after recent detections of Highly Pathogenic Avian Influenza in wild birds and the recent detection in an Indiana commercial turkey operation. (Garr Crawford and Dr. Julianna Lenoch with USDA's Animal and Plant Health Inspection Service)

Animal disease experts are collecting a massive amount of data on the outbreak of avian influenza in dairy herds. Gary Crawford has more. PARTICIPANTS: Gary Crawford and Dr. Rosemary Sifford with USDA's Animal and Plant Health Inspection Service.

Vaccinating poulty flocks against avian influenza would not totally erase the bird flu problem, says one expert. Gary Crawford has more. PARTICIPANTS: Gary Crawford and Dr. Yuko Sato with Iowa State University.

Dr. Yuko Sato with Iowa State University, talking about another aspect that would have to be considered in any future plan to vaccinate poultry flocks for avian influenza.

Vaccinating poulty flocks against avian influenza would not totally eliminate the bird flu problem, says one expert. (Gary Crawford and Dr. Yuko Sato with Iowa State University.

The current U.S. avian influenza situation is unlike past bird flu outbreaks on several levels. (Gary Crawford and Dr. Rosemary Sifford, with Veterinary Services of USDA's Animal and Plant Health Inspection Service,

Even as detections of high path avian influenza are continuing, there are at least a few encouraging signs. (Gary Crawford and Dr. Rosemary Sifford, with USDA's Animal and Plant Health Inspection Service)

Here's why dairy herd depopulation is not being advised for the current avian influenza outbreak in some dairy operations. (Gary Crawford and Dr. Rosemary Sifford with USDA's Animal and Plant Health Inspection Service)

Dr. Rosemary Sifford with USDA's Animal and Plant Health Inspection Service, saying that animal disease experts are collecting a massive amount of data on the outbreak of avian influenza in dairy herds.

Dr. Yuko Sato with Iowa State University, talking about the massive logistics that would be involved in vaccinating the nation's poultry flocks against bird flu.