<unk>  has a worldwide distribution, but it is a nonreportable<unk>  in humans, so public health data on this<unk>  are inadequate. Geographical location, present season, and variables associated with<unk> s (such as exposure and degree of flea infestation) all play a factor in the prevalence of<unk>  within a population. In warmer climates, the<unk>  is more prevalent during the fall and winter, which may be attributed to the breeding season for adult<unk> s, which allows for the birth of kittens. B henselae, the bacterium responsible for causing<unk> , is more prevalent in younger<unk> s (less than one year old) than it is in adult<unk> s. To determine recent incidence of<unk>  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<unk> , and both in- and outpatient cases were analyzed. The study revealed an incidence rate of 4.5/100,000 outpatient cases of<unk> . For inpatient cases, the incidence rate was much lower at 0.19/100,000 population. Incidence of<unk>  was highest in 2005 among outpatient cases and then slowly declined. The Southern states had the most significant decrease of incidence over time. Mountain regions have the lowest incidence of this<unk>  because fleas are not commonly found in these areas. Distribution of<unk>  among children aged 5–9 was of the highest incidence in the analyzed database, followed by women aged 60–64. Incidence among females was higher than that among males in all age groups. According to data on social trends, women are more likely to own a<unk>  over men; which supports higher incidence rates of this<unk>  in women. Risk of contracting<unk>  increases as the number of<unk> s residing in the home increases. The number of pet<unk> s in the United States is estimated to be 57 million. Due to the large population of<unk> s residing in the United States, the ability of this<unk>  to continue to infect humans is vast. Laboratory diagnosis of<unk>  has improved in recent years, which may support an increase in incidence of the<unk>  in future populations. Outbreaks Historically, the number of reported cases of<unk>  has been low, there has been a significant increase in reports in urban and suburban areas in the northeast region of United States. An example of the increased incidence can be found in Essex County, New Jersey. In 2016, there were 6 reported cases. In 2017, there were 51 reported cases. In 2018, there were 263 reported cases. Based on preliminary data, it is expected that there will be over 1,000 reported cases of<unk>  in Essex County, New Jersey. 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<unk>  is due to<unk>  owners neglecting to vaccinate their<unk> s.
Cat-scratch disease
Lymphogranuloma venereum
Diabetic dermadrome
Lymphoma
Tar melanosis
Sarcoidosis
Ichthyosis bullosa of Siemens
Brucellosis