This is a link to the proceedings of this year's vet conference at Penn.
http://www.vet.upenn.edu/docs/default-source/penn-annual-conference/pac-2014---proceedings.pdf?sfvrsn=4

It is also at the website link below, for a hot link.

The vaccination information presented by teaching vets to other vets starts on page 804850, which is 93rd page if you download the pdf document. I note that Dr. Littman still does not recommend Lyme vaccine. The dogs most likely to get Lyme nephritis can get it sooner from the vaccine than from the environment, if tick preventatives are used.

Earlier articles deal with cardiology. Those ones are a little more intense and less readable than those on vaccines.