UTMB_rabiesvirus Image from Dr. F.A. Murphy, University of Texas Medical Branch, Galveston, Texas This negatively stained and colorized micrograph of the rabies virus from an infected cell culture shows the characteristic bullet-shaped virus particles. The magnification is approximately 70,000x. For more than 60 years, Chicago logged zero cases of rabid dogs. Then, in December, a young dog that had been acting anxious and aggressive was euthanized under suspicion of rabies.