HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Watts, D. M. Articles by Hanson, R. P. Search for Related Content PubMed PubMed Citation Articles by Watts, D. M. Articles by Hanson, R. P.

Overwintering of La Crosse Virus in Aedes Triseriatus^*

La Crosse (LAC) virus was isolated from 3 suspensions of Aedes triseriatus larvae and from 1 suspension of male mosquitoes reared from larvae collected from basal tree-holes in Wisconsin during March, April, May, and June of 1973. Isolations of this virus were also obtained from 5 suspensions of A. triseriatus larvae and 4 suspensions of male mosquitoes originating from old automobile tires. Virus transmission to suckling mice was accomplished by female A. triseriatus reared from larvae collected from the tires.

Only two tree-holes and the tires yielded LAC virus-infected larvae and adults. The minimum field infection rate (MFIR) for these tree-holes and the tires, based on one infected larva per pool, was 1/110 larvae from the tree-holes and 1/20 larvae from the tires. The MFIR for adults was 1/41 male mosquitoes originating from one of the tree-holes and 1/27 for male mosquitoes originating from the tires. The MFIR for female mosquitoes reared from larvae collected from the tires was 1/110. No virus was isolated from 255 female mosquitoes reared from larvae collected from the tree-holes. These findings strongly suggest that A. triseriatus is the reservoir of LAC virus and that transovarial transmission of the virus in A. triseriatus is the mechanism responsible for the survival of this arbovirus during the winter season in the north-central United States.

Accepted for publication December 1, 1973.

^* This research was supported by research grant CC-00203 from the Center for Disease Control, Atlanta, Georgia, and by AI-07453, AI-00771, and AI-CC-11547 from the National Institutes of Health, Bethesda, Maryland.

Address reprint requests to: Dr. Wayne H. Thompson, Department of Preventive Medicine, University of Wisconsin, Room 501, State Laboratory of Hygiene, 465 Henry Mall, Madison, Wisconsin 53706.

This article has been cited by other articles:

				P. M. ARMSTRONG and T. G. ANDREADIS A new genetic variant of la crosse virus (bunyaviridae) isolated from new England. Am J Trop Med Hyg, September 1, 2006; 75(3): 491 - 496. [Abstract] [Full Text] [PDF]

				R. S. Rust, W. H. Thompson, C. G. Matthews, B. J. Beaty, and R. W.M. Chun Topical Review: La Crosse and Other Forms of California Encephalitis J Child Neurol, January 1, 1999; 14(1): 1 - 14. [Abstract] [PDF]