Following vaccination of susceptible chicks, immunity lasts up to approximately 3 to 4 months. Thereafter vaccination using other vaccine based on M41 or D207/D274 strains may be advisable.
In any animal population there will be a small number of individuals which fail to respond fully to vaccination. Successful vaccination depends upon correct storage and administration of vaccine and the animal’s ability to respond. Immune competence can be influenced by genetic factors, intercurrent infection, age, nutritional status, concurrent drug therapy, stress etc.
Disposal
Dispose of waste material by boiling, incineration or immersion in an appropriate disinfectant approved for use by the competent authorities.