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The American journal of tropical medicine and hygiene1987; 36(1); 107-113; doi: 10.4269/ajtmh.1987.36.107

Arbovirus isolations from mosquitoes collected during and after the 1982-1983 epizootic of western equine encephalitis in Argentina.

Abstract: Mosquitoes were collected in Santa Fe and Rio Negro provinces, Argentina, in 1982-1983 during a western equine encephalitis (WEE) epizootic. Totals of 153,084 mosquitoes from Santa Fe Province and 484 from Rio Negro Province were tested for virus in 2,351 pools. Seventeen virus strains were isolated, all from Santa Fe collections, as follows: 4 WEE, 6 Venezuelan equine encephalitis, 1 St. Louis encephalitis, 2 Antequera, 1 Maguari, 1 Melao, 1 new vesiculovirus (Calchaqui), and 1 Gamboa. The WEE virus isolates were from Aedes albifasciatus, Anopheles albitarsis, Mansonia species, and Psorophora pallescens. Collections during the spring and summer (1983-1984) following the epizootic yielded 49,707 mosquitoes from Santa Fe, 15,961 from Rio Negro, and 2,019 from Chubut provinces. Twenty-two virus strains were isolated, all from Santa Fe mosquitoes, as follows: 3 strains of SLE virus and 19 strains of Turlock (TUR) virus. All but one of the TUR virus isolates appear to have come from mosquitoes that engorged on a viremic chicken following entry into a bait trap. The vector relationships of each virus isolated during and after the WEE epizootic are discussed.
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Publication Date: 1987-01-01 PubMed ID: 2880521DOI: 10.4269/ajtmh.1987.36.107Google Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research paper examines the number of arboviruses, specifically the Western equine encephalitis virus, isolated from mosquitoes in Argentina during the 1982-1983 epidemic and afterwards. Researchers were also interested in the vector relationships of each virus isolated.

Study Setting and Data Collection

  • The study involved collecting mosquitoes in two provinces of Argentina, Santa Fe and Rio Negro, in 1982-1983 during an outbreak of Western equine encephalitis (WEE) and also in the spring and summer of 1983-1984 subsequent to the outbreak.
  • According to the records, a total of 153,084 mosquitoes were collected from Santa Fe Province and 484 from Rio Negro Province during the outbreak. While after the outbreak, the collection figures were 49,707 mosquitoes from Santa Fe, 15,961 from Rio Negro, and 2,019 from Chubut provinces.
  • The collected mosquitoes were then grouped into 2,351 pools and tested for the presence of the virus.

Findings of the Study

  • During the epidemic, seventeen virus strains were isolated, all of which were found in the mosquito samples from Santa Fe. The strains included 4 WEE, 6 Venezuelan equine encephalitis, 1 St. Louis encephalitis, 2 Antequera, 1 Maguari, 1 Melao, 1 new vesiculovirus (Calchaqui), and 1 Gamboa.
  • The WEE virus strains were specifically found in the Aedes albifasciatus, Anopheles albitarsis, Mansonia species, and Psorophora pallescens types of mosquitoes.
  • After the epidemic, 22 more virus strains were detected, with all being found in mosquitoes from Santa Fe. The detected strains were 3 St. Louis Encephalitis (SLE) virus and 19 Turlock (TUR) virus strains.
  • An interesting fact that emerged from the study was that except for one, all of the TUR virus isolates seem to have come from mosquitoes that had fed on a viremic chicken before getting caught in the bait trap.

Discussion

  • Vector relationships for each of these viruses relative to the initial epizootic were analysed and discussed. The term ‘vector relationship’ refers to the relationship of the virus with the mosquitoes that carry them and transmit them to other organisms. Understanding these relationships is crucial for disease control and prevention.

Cite This Article

APA
Mitchell CJ, Monath TP, Sabattini MS, Daffner JF, Cropp CB, Calisher CH, Darsie RF, Jakob WL. (1987). Arbovirus isolations from mosquitoes collected during and after the 1982-1983 epizootic of western equine encephalitis in Argentina. Am J Trop Med Hyg, 36(1), 107-113. https://doi.org/10.4269/ajtmh.1987.36.107

Publication

The American journal of tropical medicine and hygiene
ISSN: 0002-9637
NlmUniqueID: 0370507
Country: United States
Language: English
Volume: 36
Issue: 1
Pages: 107-113

Researcher Affiliations

Mitchell, C J
    Monath, T P
      Sabattini, M S
        Daffner, J F
          Cropp, C B
            Calisher, C H
              Darsie, R F
                Jakob, W L

                  MeSH Terms

                  • Aedes / microbiology
                  • Animals
                  • Anopheles / microbiology
                  • Arboviruses / isolation & purification
                  • Argentina
                  • Culicidae / microbiology
                  • Encephalitis Virus, St. Louis / isolation & purification
                  • Encephalitis Virus, Venezuelan Equine / isolation & purification
                  • Encephalitis Virus, Western Equine / isolation & purification
                  • Encephalomyelitis, Equine / transmission
                  • Insect Vectors / microbiology

                  Citations

                  This article has been cited 19 times.
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