| | Vertebrate (species and organ) and arthropod | No. isolations/No. tested | No. with antibody/No. tested Test used | Country and region |
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| * Hundreds of thousands 1943-1964 | Neutralizing and HI antibodies reported from man and lower vertebrates of USA, Canada and Argentina but since extensive overlapping occurs with antibody to other group members, they cannot be attributed to CE virus. | | Culex tarsalis | 1/ * | | California, USA (1) | Aedes melanimon (dorsalis) | 2/ * | | | Aedes vexans | 2/5,064 | | New Mexico, USA (12) | Aedes nigromaculis | 2 | | Texas, USA (12) | Psorophora signipennis | 3 | | | Culiseta inornata | 2/750 | | New Mexico, USA (12) | Aedes dorsalis | 9 | | Utah, USA (12) | Aedes melanimon | >1 | | Owen Valley, CA, USA(27) | Culiseta inornata | 1 | | Manitoba, Canada(29) |
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