recovery of tonate virus ("bijou bridge" strain), a member of the venezuelan equine encephalomyelitis virus complex, from cliff swallow nest bugs (oeciacus vicarius) and nestling birds in north america.a second virus with distinct biological, serological, and physiochemical properties was detected as a minority viral subpopulation in specimens of cliff swallow nest bugs (oeciacus vicarius) and nestling bird sera containing fort morgan (fm) virus. the second virus, detected by a breakthrough neutralization test employing fm antiserum, was present in 5 of 11 fm virus-positive pools of nest bugs and in 4 of 38 birds from colorado and south dakota. the concentration of the second virus was 10-fold ...19807435797
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