Geographical location, present season, and variables associated with cats (such as exposure and degree of flea infestation) all play a factor in the prevalence of CSD within a population. In warmer climates, the CSD is more prevalent during the fall and winter, which may be attributed to the breeding season for adult cats, which allows for the birth of kittens. B henselae, the bacterium responsible for causing CSD, is more prevalent in younger cats (less than one year old) than it is in adult cats.To determine recent incidence of CSD in the United States, the Truven Health MarketScan Commercial Claims and Encounters database was analyzed in a case control study from 2005 to 2013. The database consisted of healthcare insurance claims for employees, their spouses, and their dependents. All participants were under 65 years of age, from all 50 states. The length of the study period was 9 years and was based on 280,522,578 person-years; factors such as year, length of insurance coverage, region, age, and sex were used to calculate the person-years incidence rate to eliminate confounding variables among the entire study population.A total of 13,273 subjects were diagnosed with CSD, and both in- and outpatient cases were analyzed. The study revealed an incidence rate of 4.5/100,000 outpatient cases of cat-scratch disease. For inpatient cases, the incidence rate was much lower at 0.19/100,000 population. Incidence of CSD was highest in 2005 among outpatient cases and then slowly declined. The Southern states had the most significant decrease of incidence over time.
Although usually treated with antibiotics and minimal long-term effects, there have been 3 reported case of tachycardia more than one year after exposure. Pathologists believe that the increased incidence of CSD is due to cat owners neglecting to vaccinate their cats. History
Symptoms similar to CSD were first described by Henri Parinaud in 1889, and the clinical syndrome was first described in 1950 by Robert Debré. In 1983, the Warthin-Starry silver stain was used to discover a Gram-negative bacillus which was named Afipia felis in 1991 after it was successfully cultured and isolated. The causative organism of CSD was originally believed to be Afipia felis, but this was disproved by immunological studies in the 1990s demonstrating that people with cat-scratch fever developed antibodies to two other organisms, B. henselae (originally known as Rochalimea henselae before the genera Bartonella and Rochalimea were combined) and B. clarridgeiae, which is a rod-shaped Gram-negative bacterium. References
External links

https://www.cdc.gov/bartonella/cat-scratch/index.html
DermNet bacterial/catscratchCat Scratch Disease on National Organization for Rare Disorders site