Tuesday, May 30, 2023
| Parameter | Ixodes scapularis | Amblyomma americanum | ||
|---|---|---|---|---|
| Relative abundance of each species | CIS = 38.32 | CAA = 61.68 | ||
| Adults | Nymphs | Adults | Nymphs | |
| 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 | ||
Table. Parameters used in relative risk calculations for ehrlichiosis and Lyme disease, by vector, Monmouth County, New Jersey, USA*
*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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Health Sciences Clinical Professor, UC Irvine Department of Family Medicine; Associate Dean for Diversity and Inclusion, UC Irvine School of Medicine, Irvine, California
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The relative risk for ehrlichiosis cases compared to Lyme disease was calculated as risk = (61.68 × 9.98 × 1)/(38.32 × 26.61 × 1) = 0.604. These numbers mean that we should expect to see ehrlichiosis cases occur 0.604 times as often as Lyme disease cases.
;)
EnlargeFigure 2. Number of observed versus expected ehrlichiosis cases, Monmouth County, New Jersey, USA, 2014. Expected values calculated by using number of observed Lyme disease cases as benchmark.
In 2014, a total of 439 cases of Lyme disease were reported in Monmouth County.[22] By using the risk estimates described, we would expect there to be ≥265 cases of ehrlichiosis, >2 orders of magnitude higher than the number of cases actually observed (Figure 2).
