Hello All, Although I've used DGI as a reference for years this is my first post. I hope I'm doing this right Over the summer I talked to several people who say they give CD/T shots as often as 2-4 times a year on mature does. From what they say, the more frequent schedule helps fill in the gaps, since the vaccine is not 100% effective. They're giving the "build-up" month apart dose as kids, and then the subsequent doses are single doses given 3-6 months apart. This year we had a scare with a doe who we suspect had a Clostridial disease, although she had been vaccinated. Does anyone have any experience with doing CD/T vaccines more frequently than the usual once a year booster? Also, has anyone tried re-vaccinating (the 28 days apart dose) periodically to protect in case of an ineffective initial vaccine? I forget where I heard this, but I think someone told me that the vaccine itself is not 100% effective. Any thoughts or ideas are appreciated!! Thank you!!