Charles Louis Davis and Samuel Wesley Thompson DVM Foundation

For the Advancement of Veterinary and Comparative Pathology | Phone: 847-367-4359 | Fax: 847-247-1869
  • 2017 Descriptive Pathology Course

    Meet course lecturers, get individual feedback, and mingle with other trainees from around the world!

  • 44th Annual Gross Review Course

    Learn all about gross lesions in domestic, laboratory, and exotic animals.

  • Argentinean Division Seminar

    Dr. Donal O'Toole (second from left) is demonstrating lesions, and Dr. Melissa Macias (second from right) is translating into Spanish at the 10th seminar of the Argentinean Division of the Foundation.

  • Chilean Seminar

    Participants of the 4th Chilean Seminar of the Foundation on the campus of the University of Chile in Santiago de Chile in August 2016.

  • European Symposium

    The European Symposium of the Foundation was held in Bologna, Italy, in September 2016.

  • Northeast Day Seminar

    Janssen R&D (J&J Pharmaceuticals) and the Davis-Thompson sponsored and hosted the Northeast Day Seminar at Spring House, Pennsylvania in September 2016.

  • Zoo Pathology Workshop

    Drs. Bruce Rideout (Co-moderator), Kevin Keel (Keynote speaker), and Dalen Agnew (Co-moderator) at the 2016 Davis-Thompson/AAZV Zoo Pathology Workshop at the AAZV meeting in Atlanta, Georgia.

Most Requested Publications

We are currently having problems with our bookstore, and we are sorry for the inconvenience. Please call the Main Office at 847-367-4359 to place all orders, and they will be shipped immediately. This problem should be resolved within the month.

CE Portal

Course ID: 166024
Title: Fundamentals of Ultrastructure

Length: 02:00:00
Author: Dr. David Fritz, DVM, DACVP (retired)
Description: This 2-hour lecture on the fundamentals of ultrastucture covers the following: a) basic cellular anatomy, b) morphologic changes in degenerating cells, c) microanatomy of cell types in various organ systems, and d) ultrastructure of infectious organisms, and e) ultrastructure of various neoplasms. Dr. Fritz takes a very practical approach to this material, simplifying complex concepts and making ultrastructural description and analysis familiar for pathologists who have not ventured often into this realm.

Noah's Arkive

The Foundation is proud to make Noah's Arkive, a searchable collection of veterinary pathology images, available online at no cost. Special thanks to the University of Georgia for transferring the database and image collection to the Foundation!

Random Image:

CL Davis Diagnostic Exercises

The main goal of these Diagnostic Exercises is to provide interesting cases, focusing on the gross pathological lesions and associated histopathologic or cytologic findings. This material can be of great use for veterinary students, in-training pathologists, and ACVP diplomates alike.

There will be one contribution per month of the year; anyone may contribute. To do so, please contact Dr. Vinicius Carreira at to identify a convenient date for your submission and to receive templates to be used. Spots will be filled out on a first-come first-served basis.

Exercise Thumbnail Answer
Click here for case history Click here for case synopsis

Twitter Feed - @cldavis_vetpath

Facebook Feed - Davis/Thompson Group

New and yucky today from Noah's Archive (I don't like bugs!) but it's a way cool pic from Dr. Jim Carpenter....(it wasn't marked as to species of course or species parasitized - sorry.) But it's still a great pic - make it whatever species you want, I guess!)

This is a microscopic prep of a louse nit attached to a hair. The eggs, or nits, are glued to the base of hair shafts by specialized saliva. The eggs will hatch directly into nymphs, which resemble small adults, and go through several molts before adulthood.
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Just a reminder - inappropriate advertisements will be deleted and their posters removed from the group. Position advertisements for opportunities for residencies and faculty positions in the area of veterinary pathology and laboratory animal medicine are acceptable - those for relief vets or general practitioners are not. Let's keep on focus. ... See moreSee less

New in Noah's Arkive: 39 new images and comments from Laura Bryan of Texas A&M. Gorgeous stuff...welcome to the Noah team, Laura!

If you want to see them...just search under keywords "Laura Bryan".
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Just added today in Noah's Arkive from the collection of James Carpenter - thiamine deficiency in a cat.

These are characteristic lesions associated with thiamine deficiency in carnivores. Characteristically this pathway is affected with necrosis in the caudal colliculus (center), and various periventricular nuclei including the lateral geniculate (left) and red (right). Rarely, in severe cases in carnivores there may be laminar necrosis in the middle strata of the superficial cortex of the occipital lobe. (Laminar necrosis is the characteristic finding in ruminants).

Historically, thiamine deficiency was associated with feeding rancid fish, especially to cats and mink, but cases are more commonly seen today as a result of malnutrition or feeds that have been heated or treated with sulfates to make them look fresh.

Thiamine decarboxylase is a component of transketolase in the Krebs cycle – in deficiency, decreased levels of transketolase with increased amounts of circulating pyruvate may result in the vascular changes noted in this condition.

The histologic change is endothelial necrosis, edema, and coagulative necrosis within the affected areas.
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