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Volume 30, Number 9—September 2024
Dispatch

Epidemiology of Lyme Disease Diagnoses among Older Adults, United States, 2016–20191

Amy M. Schwartz, Christina A. Nelson, and Alison F. HinckleyComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (A.M. Schwartz, C.A. Nelson, A.F. Hinckley); University of Iowa, Iowa City, Iowa, USA (A.M. Schwartz)

Main Article

Table

Characteristics of Lyme disease diagnoses according to Medicare fee-for-service claims data versus cases identified by national surveillance in a population of persons > 65 years of age, United States, 2016–2019*

Characteristic High-incidence states
 Neighboring states
 Low-incidence states
Medicare Surveillance Medicare Surveillance Medicare Surveillance
Person-years 72,298 NA 5,958 NA 10,009 NA
Diagnoses or cases, no. 72,455 31,879 5,978 1,714 10,052 590
Diagnoses or cases, % 81.9 93.3 6.7 5.0 11.3 1.7
Incidence among men 422.9 71.0 38.3 4.6 30.1 0.6
Incidence among women 321.3 46.6 33.4 3.0 29.2 0.5
Occurring in May–August, % 59.5 72.2 58.2 79.9 45.8 66.2
Median incidence, 2016–2019 (range) 346.9
(337.2–417.8)		 57.1 
(52.9–65.6) 35.3 
(27.9–36.6) 3.6 
(2.4–5.3) 29.4
(27.7–31.6)		 0.6
(0.5–0.6)

*Incidence calculated as diagnoses/100,000 person-years in Medicare fee-for-service or cases/100,000 population among each surveillance subcategory. NA, not applicable.

Main Article

1Preliminary results from this study were presented at the International Conference on Emerging Infectious Diseases; August 7–10, 2022, Atlanta, Georgia, USA.

Page created: August 13, 2024
Page updated: August 21, 2024
Page reviewed: August 21, 2024
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