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SUMMARY Different L-R 'non-producer' cell lines synthesized one of two types of RSV(O), distinguishable by host range. RSVp(O) has no known natural host. RSVfl(O) i~ infectious for Japanese quails, European pheasants and some Brown Leghorn~ White Leghorn and Reaseheath I x C hybrid chickens. The host range of RSVfl(O) is distinct from other avian tumour viruses. Host susceptibility to RSVfl(O) is genetically determined in a complex and as yet unclear way. It is not correlated with response to the A, B, and C sub-groups of avian tumour viruses Or with presence of the natural antigen which reacts in the COFAL test: nor is it sex-linked. RSVfl(O) is not markedly oncogenic in hamsters. The difference between RSV~ (O) and RSVfl (O) did not appear to be aheritable property of the RSV particle but depended on the type of host cell in which the virus was cloned. Synthesis of RSVfl(O) occurred only afterpassage through COFAL positive host cells. The possible control of the infectious properties of RSVfl(O) by a helper virus present in an elusive form in permissive hosts is discussed. A stock of inactivated Sendai virus commonly used for cell fusion was apparently contaminated with an active avian leukosis virus.

The Host Range of BRYAN Strain Rous Sarcoma Virus Synthesized in the Absence of Helper Virus