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Volume 8, Number 5—May 2002

Genetic Variants of Ehrlichia phagocytophila1, Rhode Island and Connecticut

Robert F. Massung*, Michael J. Mauel†, Jessica H. Owens*, Nancy Allan*, Joshua W. Courtney*, Kirby C. Stafford‡, and Thomas N. Mather†Comments to Author 
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †University of Rhode Island, Kingston, Rhode Island, USA; ‡Connecticut Agricultural Experiment Station, New Haven, Connecticut, USA

Main Article

Table 3

Host and vector associations of Ehrlichia phagocytophila and the four 16S rDNA sequence variants detected in Rhode Island,1996–1999

Host or tick species EP-ha Variant 1a Variant 2 Variant 3 Variant 4
Ixodes scapularis ticks + + +
White-footed mouse + +
Eastern chipmunk + + +
White-tailed deer +
Humanb +

aVariant 1 detected only in ticks in Rhode Island and Connecticut; positive deer samples were collected in Maryland and Wisconsin (13,14).
bBased on samples from 35 confirmed human infections from various states, including Rhode Island and Connecticut.

Main Article

1Since this study was conducted, new nomenclature (Anaplasma phagocytophila) has been proposed; see Dumler JS, Barbet AF, Bekker CP, Dasch GA, Palmer GH, Ray SC, et al. Reorganization of genera in the families Rickettsiaceae and Anaplasmataceae in the order Rickettsiales: unification of some species of Ehrlichia with Anaplasma, Cowdria with Ehrlichia, and Ehrlichia with Neorickettsia, descriptions of six new species combinations and designation of Ehrlichia equi and ‘HGE agent’ as subjective synonyms of Ehrlichia pagocytophila. Int J Syst Evol Microbiol 2001;51:2145-65.

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