Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Ehrlichiosis as a "rare disease". More information about Ehrlichiosis is available from Orphanet
302 annual cases (203 of human granulocytic ehrlichiosis and 99 of human monocytic ehrlichiosis) notified in USA 1999 (MMWR 1999) ... see also overview of Ehrlichiosis.
approx 1 in 900,662 or 0.00% or 301 people in USA [Source statistic for calcuation: "302 annual cases (203 of human granulocytic ehrlichiosis and 99 of human monocytic ehrlichiosis) notified in USA 1999 (MMWR 1999)" -- see also general information about data sources]
301 per year, 25 per month, 5 per week, 0 per day, 0 per hour, 0 per minute, 0 per second. [Source statistic for calculation: "302 annual cases (203 of human granulocytic ehrlichiosis and 99 of human monocytic ehrlichiosis) notified in USA 1999 (MMWR 1999)" -- see also general information about data sources]
During 1986 to 1997, health departments and other diagnostic laboratories reported over 1200 cases of human ehrlichiosis to CDC (Figure 12). (Source: excerpt from Ehrlichiosis: Epidemiology: DVRD)
16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the prevalence and/or incidence of Ehrlichiosis.
Ehrlichiosis is caused by Ehrlichia organisms, specifically E. chaffeensis and granulocytic Ehrlichia. Known vectors include the lone star tick (Amblyomma americanum), the American dog tick (Dermacentor variabilis), and deer ticks (Ixodes dammini and Ixodes scapularis).
In the United States, most cases of ehrlichiosis are reported in the south-central and southern Atlantic areas of the country, but it has also been reported in the upper midwest. Persons at highest risk include those who live in endemic and highly wooded areas, engage in activities in high grassy areas, and own a pet that may introduce a tick into the home.
Source: Professional Guide to Diseases (Eighth Edition), 2005
HGE:
Source: The 5-Minute Pediatric Consult, 2008
The term 'prevalence' of Ehrlichiosis usually refers to the estimated population of people who are managing Ehrlichiosis at any given time. The term 'incidence' of Ehrlichiosis refers to the annual diagnosis rate, or the number of new cases of Ehrlichiosis diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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