| | Vertebrate (species and organ) and arthropod | No. isolations/No. tested | No. with antibody/No. tested Test used | Country and region |
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| * = pools tested | NOTE: Most isolates so designated because of plaque characteristics in DECC, nonpathogenicity for suckling mice inoculated ic, and failure of original suspensions to produce plaques on Vero cells. However, significant PRNT antibodies against 69V-2161 were found in rabbits inoculated with one isolate from P. domesticus, 4 from Cx tarsalis, and 1 additional strain from Cx pipiens. | | Passer domesticus (bird) | 1/2,128 | | Texas, USA, 1967 | Culex tarsalis | 1/124 * | | | Culex tarsalis | 5/899 | | Texas, USA, 1969 | Culex tarsalis | 13/347 | | Colorado, USA, 1969 | Culex tarsalis | 1/45 | | Utah, USA, 1969 | Culex tarsalis | 2/100% | | Colorado, USA, 1970 | Culex pipiens | 2/36 | | Oregon, USA, 1969 | Culex pipiens | 1/28 | | Colorado, USA, 1969 |
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