Acute bee-paralysis and sacbrood viruses, which multiply in the honey-bee ( L.), have some properties similar to those of the mammalian picornaviruses. Both bee viruses infect their host via the alimentary canal and are neurotropic in adult bees (Bailey & Milne, 1969; Bailey & Fernando, 1972), although they are serologically unrelated (Bailey, Gibbs & Woods, 1964) and differ fundamentally in their ecology and pathology (Bailey, 1965, 1967, 1969). The two viruses also resemble the mammalian picornaviruses in some physico-chemical properties. For example, they are isometric particles 28 nm in diameter, have sedimentation coefficients of 160 S (Bailey, Gibbs & Woods, 1963, 1964) and are resistant to ether. Lee & Furgala (1965) provided chemical evidence that sacbrood virus contains RNA. In this paper we describe other physico-chemical properties of the two viruses and compare these with those of the mammalian picornaviruses.


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