Vaccinosis is a disease syndrome caused by a weakness that can be attributed to over-vaccination. It is a term used within the integrative and homeopathic veterinary community and is defined as "ill effects of vaccination". Dr. Richard Pitcairn defines vaccinosis as “Vaccinosis is to be understood as the disturbance of the vital force by vaccination that results in mental, emotional, and a physical change that can, in some cases, be a permanent condition”.