“…Egg transmission of the "CRD agent" has been shown to occur by Van Roekel, Beninato and Olesiuk (1954), and Cover and Waller (1954). Air-borne or contact transmission of CRD has also been demonstrated by Grumbles and Boney (1952) and Fahey and Crawley (1955). Direct transfer of PPLO via the avian egg has been proven by Fahey and Crawley (1954b) and the CRD virus has also been isolated by Fahey and Crawley (1954c) from eggs produced by hens with an active infection.…”
“…Egg transmission of the "CRD agent" has been shown to occur by Van Roekel, Beninato and Olesiuk (1954), and Cover and Waller (1954). Air-borne or contact transmission of CRD has also been demonstrated by Grumbles and Boney (1952) and Fahey and Crawley (1955). Direct transfer of PPLO via the avian egg has been proven by Fahey and Crawley (1954b) and the CRD virus has also been isolated by Fahey and Crawley (1954c) from eggs produced by hens with an active infection.…”
“…The cause of this disease is now generally considered to be a pleuropneumonia-like organism (PPLO) ( 1,2). Rabbit pituitaries from animals exposed to 750 and 1100 r of total body Cobalt-60 gamma irradiation showed an early suppression of gonadotropin principles as measured by the chick gonad response.…”
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