Αναζήτηση
Αποτελέσματα 1-3 από 3
Bacterial live vaccines with graded level of attenuation achieved by antibiotic resistance mutations: transduction experiments on the functional unit of resistance, attenuation and further accompanying markers
(1998)
At least 10% of spontaneous chromosomal antibiotic resistant mutants of bacteria express a strain-dependent graded reduction of virulence; this correlates linearly with a prolonged generation time. Occasionally, these ...
Naturally occurring subclinical ovine mastitis associated with Listeria monocytogenes
(1998)
Mammary infection with and faecal excretion of Listeria monocytogenes and somatic cell counts in milk were monitored in 98 ewes in a population of 335 in two flocks. From these 98 ewes, three samples were obtained throughout ...
Incidence risk and aetiology of mammary abnormalities in dry ewes in 10 flocks in Southern Greece
(1998)
In a field investigation of 10 flocks in Southern Greece, 3367 dairy ewes were examined twice, in order to estimate the incidence risk and the aetiology of mammary abnormalities during the dry-period. Abnormal secretion, ...