These touch on various issues of vaccination, the first one is the only one directly with ferrets: http://www.vetpathology.org/cgi/content/abstract/40/3/288 Histology and Immunohistochemistry of Seven Ferret Vaccination-site Fibrosarcomas http://www.ivis.org/advances/Infect_Dis_Carmichael/schultz/chapter_frm.asp?LA=1 Schultz Duration of Immunity 3 Part Article http://www.austinholistic.com/articles/FW001.html http://www.austinholistic.com/articles/FW002.html http://www.austinholistic.com/articles/FW003.html http://www.positivehealth.com/permit/Articles/Animals/horses.htm http://www.holisticat.com/vaccinations.html http://www.mercola.com/2003/jul/26/vaccine_complications.htm http://www.vetinfo.com/dencyclopedia/dehod.html HOD in dogs- vaccine reaction http://www.inkabijou.co.uk/dodds.htm Dr. Dodds - Immune System Dr. Dodds on the Immune System & Disease Resistance http://www.ipawsforacause.com/PDF%20files/Dodds03CanineThyroidAutoimmune.pdf Canine Thyroid & Autoimmune Disease Genetics, Nutrition, & Vaccine Related Issues, By Dr. Dodds http://www.positivehealth.com/permit/Articles/Animals/horses.htm http://www.itsfortheanimals.com/Adobe/DrMcCluggage.pdf http://www.mercola.com/2003/jul/26/vaccine_complications.htm http://www.api4animals.org/560.htm http://www.api4animals.org/858.htm The links Sukie provided are very informative: http://www.cdc.gov/nip/publications/fs/gen/howvpd.htm *Antibodies and memory cells stay on guard in the body for years after the vaccination to safeguard it from the real disease germs.* Some are PDF files, you can download the reader here: http://www.adobe.com/products/acrobat/readstep2.html ~Amy~ [Posted in FML issue 4642]