Emergence of tick-borne granulocytic anaplasmosis associated with habitat type and forest change in northern California

Janet E. Foley, Nathan C. Nieto, Patrick Foley

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

An important ecosystem service of intact forests is protection from some emerging infectious diseases.Tick-transmitted disease granulocytic anaplasmosis increasingly occupies second-growth forest. We hypothesized that areas of second growth would have increases in tick and rodent abundance, facilitating emergence of anaplasmosis. We predicted Anaplasma phagocytophilum presence as a function of biocomplexity and forest structure, including vegetation, ticks, and rodents in four sites in California. Significant risk factors for exposure included host species (woodrats with 13% seroprevalence, odds ratio [OR] = 8.3 and chipmunks with 27% seroprevalence, OR = 20.7), and park location (northern parks, OR 25.5-27.7). Exposure to A. phagocytophilum was more likely among chipmunks in redwood sites at one park, but with woodrats and oaks at another. Overall, transects on which small mammals showed greatest A. phagocytophilum exposure had high biodiversity in ticks, rodents, and vegetation, as well as intermediate-sized trees with a high mean and variance in diameter at breast height, findings which suggest that a dilution effect, where increased biodiversity reduces disease risk, does not necessarily apply in this system. Thus, enzootic and potentially emerging anaplasmosis were linked to high biodiversity and mature second-growth forest.

Original languageEnglish (US)
Pages (from-to)1132-1140
Number of pages9
JournalAmerican Journal of Tropical Medicine and Hygiene
Volume81
Issue number6
DOIs
StatePublished - Dec 1 2009
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Parasitology
  • Virology
  • Infectious Diseases

Cite this