he number of female cats reimbursed for pyometra was
791 in the veterinary care population, and the mean IR thus
17 per 10,000 CYAR. The IR varied significantly by breed,
from five in the Russian blue to 433 in the Sphynx (Tables 2
and 3), but did not depend on whether cats lived in urban or
other areas. The median age of diagnosis was 4 years; the IR
increased with age and was more pronounced after 7 years
of age (Fig. 1). In total, 19 of 335 cats died because of pyometra,
leading to a mean case fatality rate of 5.7% in the
population calculated from the combined data set.