| Autor: |
Reisen WK; Center for Vectorborne Diseases, Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, California 95616, USA. arbo123@pacbell.net, Martinez VM, Fang Y, Garcia S, Ashtari S, Wheeler SS, Carroll BD |
| Jazyk: |
angličtina |
| Zdroj: |
Vector borne and zoonotic diseases (Larchmont, N.Y.) [Vector Borne Zoonotic Dis] 2006 Fall; Vol. 6 (3), pp. 248-60. |
| DOI: |
10.1089/vbz.2006.6.248 |
| Abstrakt: |
Gambel's and California quail were infected repeatedly whenever western equine encephalomyelitis virus (WEEV), St. Louis encephalitis virus (SLEV), and (WNV) West Nile virus were active during summer in California. The timing of virus appearance and quail infection coincided well with the appearance of chicks in nature, leading us to hypothesize that large coveys containing these non-immune birds could be important in focal virus amplification in rural settings. However, experimental infection studies with chicks, juveniles, and adults of both quail species using sympatric strains of WEEV, SLEV, and WNV indicated that only immature birds were competent hosts for WEEV, producing viremias sufficiently elevated to efficiently infect Culex tarsalis mosquitoes. Quail were less competent hosts for WNV and were incompetent for SLEV. Large populations of quail that frequently are infected with SLEV or WNV, but produce low to moderate viremias, may serve as dead end hosts for these viruses. Due to their abundance and repeated infection, these birds may attenuate virus amplification in rural areas of California and possibly could be one reason why WNV epidemics seem to occur more frequently in urban and periurban than in rural landscapes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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