Data & Statistics

Annual Summaries

Number and incidence of reported cases of babesiosis, by state and year, 2011–2018*

	2011		2012		2013		2014		2015		2016		2017		2018
State†	No.	Rate‡	No.	Rate	No.	Rate	No.	Rate	No.	Rate	No.	Rate	No.	Rate	No.	Rate
Alabama	1	<0.1	0	0.0	0	0.0	1	<0.1	2	<0.1	0	0.0	1	<0.1	0	0
Alaska§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Arizona	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0	0
Arkansas	—	—	—	—	—	—	—	—	0	0.0	1	<0.1	0	0.0	2	<0.1
California	1	<0.1	4	<0.1	3	<0.1	3	<0.1	5	<0.1	3	<0.1	4	<0.1	6	<0.1
Colorado§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Connecticut	74	2.1	123	3.4	268	7.5	205	5.7	328	9.1	322	9.0	309	8.6	248	6.9
Delaware	1	0.1	0	0.0	2	0.2	1	0.1	1	0.1	2	0.2	4	0.4	3	0.3
District of Columbia	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2	0.3
Florida	—	—	—	—	—	—	—	—	—	—	—	—	9	<0.1	19	<0.1
Georgia	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0	0
Hawaii§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Idaho§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Illinois	—	—	—	—	—	—	1	<0.1	3	<0.1	2	<0.1	0	0.0	1	<0.1
Indiana	0	0.0	1	<0.1	1	<0.1	0	0.0	0	0.0	0	0.0	1	<0.1	1	<0.1
Iowa	—	—	—	—	—	—	—	—	—	—	—	—	2	0.1	0
Kansas	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0	0
Kentucky	—	—	—	—	—	—	—	—	0	0.0	0	0.0	0	0.0	0	0
Louisiana	—	—	—	—	2	<0.1	0	0.0	1	<0.1	0	0.0	1	<0.1	1	<0.1
Maine	9	0.7	10	0.8	36	2.7	42	3.2	55	4.1	82	6.2	118	8.8	101	7.5
Maryland	4	0.1	3	0.1	9	0.2	2	<0.1	4	0.1	6	0.1	5	<0.1	7	0.1
Massachusetts	208	3.1	261	3.9	417	6.2	535	7.9	444	6.	517	7.6	591	8.6	527	7.6
Michigan	0	0.0	0	0.0	2	<0.1	2	<0.1	3	<0.1	2	<0.1	3	<0.1	1	<0.1
Minnesota	73	1.4	41	0.8	64	1.2	49	0.9	45	0.8	50	0.9	60	1.1	49	0.9
Mississippi§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Missouri	—	—	—	—	—	—	—	—	—	—	1	<0.1	0	0.0	0	0
Montana	—	—	—	—	—	—	0	0.0	0	0.0	1	0.1	0	0.0	0	0
Nebraska	0	0.0	1	0.1	1	0.1	0	0.0	0	0.0	1	0.1	0	0.0	0	0
Nevada	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
New Hampshire§	13	1.0	19	1.4	22	1.7	42	3.2	53	4.0	13	1.0	78	5.8	37	2.7
New Jersey	166	1.9	92	1.0	171	1.9	159	1.8	281	3.1	174	1.9	193	2.1	247	2.8
New Mexico§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
New York	418	2.1	253	1.3	534	2.7	471	2.4	581	2.9	430	2.2	696	3.5	641	3.3
North Carolina§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
North Dakota	1	0.1	0	0.0	1	0.1	0	0.0	3	0.4	1	0.1	0	0.0	1	0.1
Ohio	—	—	—	—	—	—	1	<0.1	2	<0.1	—	—	1	<0.1	4	<0.1
Oklahoma§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Oregon	1	<0.1	0	0.0	0	0.0	1	<0.1	2	<0.1	2	<0.1	5	0.1	2	<0.1
Pennsylvania§	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Rhode Island	73	6.9	56	5.3	142	13.5	172	16.3	190	18.0	155	14.7	161	15.2	165	15.6
South Carolina	—	—	—	—	1	<0.1	3	0.1	2	<0.1	2	<0.1	2	<0.1	1	<0.1
South Dakota	—	—	—	—	1	0.1	1	0.1	0	0.0	0	0.0	0	0.0	0	0
Tennessee	1	<0.1	0	0.0	0	0.0	0	0.0	1	<0.1	1	<0.1	1	<0.1	1	<0.1
Texas	—	—	—	—	1	<0.1	1	<0.1	1	<0.1	1	<0.1	0	0.0	2	<0.1
Utah	—	—	—	—	—	—	0	0.0	0	0.0	0	0.0	1	<0.1	1	<0.1
Vermont	2	0.3	2	0.3	6	1.0	3	0.5	9	1.4	15	2.4	22	3.5	21	3.4
Virginia	—	—	—	—	—	—	—	—	—	—	—	—	0	0.0	5	<0.1
Washington	0	0.0	0	0.0	1	<0.1	4	0.1	2	<0.1	0	0.0	1	<0.1	0	0
West Virginia	—	—	—	—	0	0.0	0	0.0	0	0.0	0	0.0	1	0.1	1	<0.1
Wisconsin	80	1.4	45	0.8	76	1.3	43	0.7	56	1.0	68	1.2	88	1.5	64	1.1
Wyoming	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0
Total¶	1,126	0.8	911	0.6	1,761	1.0	1,742	0.8	2,074	0.9	1,909	0.8	2,358	0.9	2161	0.77

* Year as reported by the health department

† Cases were reported by state of residence, which was not necessarily the state of exposure.

‡ Rate per 100,000 population (10)

§ Babesiosis is not a reportable condition by law in these states

¶ The denominators for calculations of total incidence rates included only the populations of states in which babesiosis was a reportable condition during the pertinent year.

Page last reviewed: October 20, 2020

Content source: Global Health, Division of Parasitic Diseases and Malaria