If your horse isn't actively competing, is older or mostly used for pleasure, and not exposed to a lot of outside horses, he or she may be a good candidate for nosodes. The philosophy of vaccinating is very similar to the homeopathic Laws of Similar.
Vaccines come in live or killed forms.
A live vaccine carries a live virus or bacteria that has been modified so that it stimulates immunity without causing the disease. A nosode is a disease product obtained for any affected part of the system in a case of illness and thereafter potentised. The causative organism may or may not be present in the material, and the efficiency of the nosode in no way depends on the organism being present. The response of the tissue to invasion by bacteria or virus results in the formation of substances which are in effect the basis of the nosode. The main differences lie in the administration and side effects.