Leslie, I just had 4 of mine done. The other 4 will be enrolled later in the year on the anniversaries of their last distemper vaccine. An aside - fellow Canadians you can participate in this study as well! Dr. Heller has been negotiating with Cornell U. to get the results sent to the submitting vets - but so far that isn't happening. Its not a big deal though because you just contact her, give her your fuzzies names and she looks them up for you. It takes about 2 weeks for the test results to come in. I am so glad I enrolled in this study. My two sprites who were vaccinated in April 2006 are still well protected - with titer values of 512 and 192 (anything over 32 is considered protective); the other two who were vaccinated April 2007 had values of 768 and 384. Tressie A. Dutchyn, PhD (c) Dalhousie University Research Associate, Community Health & Epidemiology http://port.mcgill.ca/dutchyn.htm [Posted in FML 5955]