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Volume 23, Number 6—June 2017

Relative Risk for Ehrlichiosis and Lyme Disease in an Area Where Vectors for Both Are Sympatric, New Jersey, USA

Andrea EgiziComments to Author , Nina H. Fefferman, and Robert A. Jordan
Author affiliations: Rutgers University, New Brunswick, New Jersey, USA (A. Egizi, N.H. Fefferman, R.A. Jordan); Monmouth County Mosquito Control Division, Tinton Falls, New Jersey, USA (A. Egizi, R.A. Jordan); University of Tennessee, Knoxville, Tennessee, USA (N.H. Fefferman)

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Parameters used in relative risk calculations for ehrlichiosis and Lyme disease, by vector, Monmouth County, New Jersey, USA*

Parameter Ixodes scapularis Amblyomma americanum
Relative abundance of each species CIS = 38.32

CAA = 61.68

Relative abundance of each life stage CIS. D = 19.96 CIS. N = 80.04 CAA. D = 35.34 CAA. N = 64.66
Infection rates per life stage
IIS. D = 39.87
IIS. N = 23.3

IAA. D = 11.7
IAA. N = 9.04
Infection rates, weighted IIS = 26.60 IAA = 9.98

*Values are in percentages. Relative abundances (denoted by CX) are derived from specimens submitted to the Monmouth County Mosquito Control Division’s tick identification and testing service during peak Lyme disease transmission season (May–August) and during a 10-year period (2006–2015). Infection rates of I. scapularis ticks with Borrelia burgdorferi (IIS) also from passive surveillance program. Infection rates of A. americanum ticks (IAA) encompass both Ehrlichia chaffeensis and E. ewingii (accounting for co-infection).

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Page created: May 11, 2017
Page updated: May 11, 2017
Page reviewed: May 11, 2017
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