Enterotoxigenic Escherichia coli K99 is one of the dominant pathogens associated with diarrhea of calves. Immunoglobulin Y (IgY), has been used as an inexpensive alternative to antibiotics for the prevention and therapy of several bacterial infections. The study aimed to prepare IgY antibodies against E. coli K99 and to investigate its in vitro effectiveness. E. c...

This study was aimed at determining and comparing the diagnostic accuracy of digital optical Brix refractometers (D-Brix O-Brix, respectively) for estimation passive immunity status (

Experiments involving active immunization have shown' that infection with a non-virulent B. aertrycke produces in mice a high degree of immunity to infection with virulent B. enteritidis. It also appeared that a non-virulent enteritidis organism conferred a cross protection to infection with B. aertrycke. Furthermore, in the immunities so disclosed the protection failed to bear any relationship...