Annotations on some of the following observations may be found in Roth and Willis (1957a). Use of asterisk is explained in footnote POLIOMYELITIS VIRUSES* Lansing strainExperimental vectors.—Blattella germanica, U.S.A. (Hurlbutt, 1949, 1950). Periplaneta americana, U.S.A. (Hsiang et al., 1952). * Brunhilde type, Minnesota and Mahoney strainsExperimental vectors.—Periplaneta americana, U.S.A. (Fischer and Syverton, 1951; Syverton et al., 1952). * Columbia SK virusExperimental vectors.—Periplaneta americana, Great Britain? (Findlay and Howard, 1951): Results with Blattella germanica were negative. * Four unspecified strainsNatural vectors.—Blattella germanica and/or Blattella vaga, Periplaneta americana and/or Periplaneta brunnea, and Supella supellectilium, U.S.A. (Syverton et al., 1952; Dow, 1955; Dow in Roth and Willis, 1957a). OTHER VIRUSES* Coxsackie virusesExperimental vectors.—Periplaneta americana, U.S.A. (Fischer and Syverton, 1951a, 1957): Recently Fischer and Syverton (1957) found that after feeding a single meal of Coxsackie virus to Periplaneta americana, the gastrointestinal tracts of the insects, which were removed at 5-day intervals up to 20 days, contained sufficient virus to paralyze and kill test mice. Cockroach salivary glands, removed 5 days after the insects had fed, contained the virus which caused paralysis and death in test mice; mice were also infected by virus obtained from salivary glands removed from the insects 10 and * Mouse encephalomyelitis virusExperimental vectors.—Periplaneta americana, U.S.A. (Syverton and Fischer, 1950). * Yellow-fever virusExperimental vectors.—Blattella germanica, Great Britain? (Findlay and MacCallum, 1939). |