Population indices of chiggers (Leptotrombidium deliense) and incidence of scrub typhus in Chinese military personnel, Pescadores Islands of Taiwan, 1976-1977

J. G. Olson, A. L. Bourgeois, R. C.Y. Fang

Research output: Contribution to journalArticle

Abstract

Larval Leptotrombidium deliense were recovered from live-trapped Suncus murinus, Rattus rattus and R. norvegicus captured in the Pescadores Islands of Taiwan during 1976 and 1977. Weekly and monthly indices of chigger infestation expressed as a percentage of hosts infested and the number of chiggers per host for S. murinus and Rattus spp. were calculated. Close correlations were observed between monthly indices of L. deliense measured for S. murinus and Rattus spp. and the number of laboratory-confirmed cases of scrub typhus per month. Weekly indices from S. murinus correlated more closely with number of cases than did weekly indices from Rattus spp. The critical level of chigger infestation necessary for a single case of scrub typhus in a month was estimated at 0·69 chigger per S. murinus and 0·68 chigger per Rattus spp. The weekly index of chigger infestation necessary for a single case of scrub typhus during a week was calculated at 0·47 chiggers per shrew. Critical levels of chigger infestations expressed as percentages of hosts infested were not calculated.

Original languageEnglish (US)
Pages (from-to)85-88
Number of pages4
JournalTransactions of the Royal Society of Tropical Medicine and Hygiene
Volume76
Issue number1
DOIs
StatePublished - 1982
Externally publishedYes

ASJC Scopus subject areas

  • Parasitology
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

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