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reference : Effects of climate on variability in Lyme disease incidence in the northeastern United States

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article
Effects of Climate on Variability in Lyme Disease Incidence in the Northeastern United States
Bibliographic fields
reftype Journal Article
Abstract Numbers of reported Lyme disease cases have increased dramatically over the past decade in the northeastern United States, but the year-to-year variability is sizable (average standard deviation ~30% of the mean). An improved understanding of the causes of such variability would aid in prevention and control of the disease, which is transmitted by a spirochete carried in the “black-legged” tick, Ixodes scapularis. In this study, the variability in reported Lyme disease incidence between 1993 and 2001 in seven northeastern US states was analyzed as an outcome of weather variability. For all seven states analyzed, significant (p < 0.05) positive relations were found for the correlation of early summer disease incidence with the June moisture index (Palmer Hydrological Drought Index) in the region 2 years previously. The correlations may reflect enhanced nymph tick survival in wetter conditions. Few significant relations were found with same-year moisture index, which suggests that moisture has a greater effect on nymph tick survival following the insect’s blood meal than before. In some states, significant correlations were observed related to warmer winter weather a year and a half prior to disease incidence, which may have been due to higher survival and activity levels of the white-footed mouse, the main host for Lyme disease-infected ticks.
Author Subak, Susan
DOI 10.1093/aje/kwg014
Date March 15, 2003
ISSN 1476-6256
Issue 6
Journal American Journal of Epidemiology
Pages 531-538
Title Effects of climate on variability in Lyme disease incidence in the northeastern United States
URL http://aje.oxfordjournals.org/content/157/6/531.full.pdf+html
Volume 157
Year 2003
Bibliographic identifiers
.reference_type 0
_chapter ["Ch. 16: Northeast FINAL"]
_record_number 3982
_uuid 8856aecc-549d-44b6-99ef-61d2d2d24905