Investigations at Pirbright have shown that strains of virus which a re attenuated and immunogenic for cattle were also attenuated for sheep and produced a good immune response (Report, 1964). The work of Geering & Pay (1963) included studies with the RV11 vaccine strain, which at a high dosage level caused no post vaccinal reactions in a group of twenty four-month old lambs. Examination of the...

Newcastle disease is characterized by respiratory manifestations in association with nervous and/or digestive symptoms. Its prevention is done by vaccination with live attenuated (lentogenic strains) and/or killed vaccines. The lentogenic strains can lead to strong post-vaccination reaction, principally due to the presence of other pathogenic agents. Among them, Mycoplasma synoviae is worldwide...

The aim of the study was to improve methods for verifying vaccine strain Francisella tularensis 15 NIIEG during long-term storage under current conditions. Materials and . paper summarizes results studying phenotypic genetic properties lyophilized cultures F. (1953, 1966, 1969, 1987, 1990, 2003, 2012 2013) stored at SCEMAP a period one 60 years. Results discussion Previous studies have revealed...

background : clostridium perfringens type c strains cause severe necrotizing enteritis in sheep, calves, goats, pigs and humans. beta-toxin is introduced to be the essential virulence factor of this microorganism. in the present study, a new method was established for the purification of beta toxin from culture supernatant fluid of c. perfringens type c vaccinal strain. methods : the four steps...

The purpose of this study is investigate Differentiation Between Vaccinal and Iranian Virulent Isolates of Newcastle Disease Virus based on F Region Genotyping by HRM Analysis. Discrimination of circulating virulent strains of Newcastle Disease Virus (NDV) from low pathogenic and vaccine stains is the basis for implementation of strategies to control and eradication of that aims at the eradicat...

background and objectives : dna molecular weight marker is widely used in molecular biology experiments incurring considerable costs on low-budget settings. materials and methods : here a pcr-supported procedure is described that uses 10 primer pairs targeting chromosomal dna from the harmless vaccinal bacillus anthracis sterne 34f2 strain as template. a single pcr protocol is used to reproduce...