CHICKEN ANAEMIA VIRUS (CAV) OF WEAKENED PATOGENICITY, VACCINE FOR PROTECTING POULTRY AGAINST CAV AND METHOD OF OBTAINING CAV OF WEAKENED PATHOGENICITY

摘要

The present invention provides a new antigenic type of chicken anaemia viruses (CAV). The CAV according to this invention is isolatable from turkeys in the field and its virulence for chickens is significantly reduced. This property makes these viruses particularly suited for preparing a live vaccine for protecting poultry against disease conditions resulting from CAV infection.