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Levine, S. and D. Neisen. RIF infection in a commercial flock of chickens. Avian Dis. 8:358-368, 1964. 7. Reed, L. J. and H. Muench. A simple method of estimating fifty per cent endpoints. Amer. J. Hyg. 27:493-497, 1938. 8. Rubin, H. A virus in chick embryos which induces resistance in vitro to infection with Rous sarcoma virus. Proc. Nat. Acad. Sci. 46:1105-1119, 1960. 9. Sarma, P. S., R. J. Heubner and D. Armstrong. A simplified tissue culture tube neutralization test for Rous sarcoma virus antibodies. Proc. Soc. Exptl. Biol. Med. 115: 481-486, 1964. 10. Waters, N. F. and A. K. Fonites. Genetic response of inbred lines of chickens to Rous sarcoma virus. J. Nat. Cancer Inst. 25:351-357, 1960.
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Fitzgerald et al. (1966) studied this question.
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