The role of the enzyme neuraminidase in pathogenicity of the bacillus Erysipelothrix rhusiopathiae was studied. Different substances with low and high molecular weight were tested as inducers of E. rhusiopathiae neuraminidase biosynthesis. It was found that macromolecular complexes induce the secretion of the enzyme. K(M) values for different substrates showed that the affinity of the E. rhusio...

Newcastle disease virus (NDV) was isolated from a field outbreak in pigeons. The virus was characterized by haemagglutination test (HA) and confirmed by haemagglutination inhibition test (HAI). The pathotyping was done by mean death time (MDT), intracerebral pathogenicity index (ICPI) and intravenous pathogenicity index (IVPI). The ELD50 of the velogenic strain was 10/0.1 ml. Thirty-nine pigeon...

background: acanthamoeba genus is introduced as opportunistic and cosmopoli-tan parasite. monkey and wistar rat are appropriate models for experimental study on acanthamoeba infection. in this study acanthamoeba spp. were isolated from hot spring (hs), windows dust (wd) and a corneal sample of keratitis patient (kp) and their pathogenicity surveyed by in vitro and in vivo tests. methods: isolat...

an experiment was carried out in 2008-2009 to study the correlation between the reaction to potassium chlorate and pathogenicity on some iranian isolates of macrophomina phaseolina, the causal agent of soybean charcoal rot. from among a total of 48 collected isolates from the major soybean cultivation areas of golestan, mazandaran, ardabil, and lorestan provinces, twenty four isolates were sele...

AIM To determine the prevalence, antibiogram and pathogenicity of Salmonella spp. in the common food animals slaughtered for consumption purpose at government approved slaughter houses located in and around Nagpur region during a period of 2010-2012. MATERIALS AND METHODS A total of 400 samples comprising 50 each of blood and meat from each slaughtered male cattle, buffaloes, pigs and goats w...

Intracellular pathogens and other organisms have evolved mechanisms to exploit host cells for their life cycles. Virulence genes of some intracellular bacteria responsible for these mechanisms are located in pathogenicity islands, such as secretion systems that secrete effector proteins. The Francisella pathogenicity island is required for phagosomal escape, intracellular replication, evasion o...

16 isolates of fusarium culmorum obtained from washington, north dakota and minnesota were tested for pathogenicity on five cultivars and lines: chevron, ci 9549, excel, karl, larker, morex, robust, m48, m66 and m69 were evaluated for reaction to the mixture of all isolates of the pathogen under field condition. the results of glasshouse test indicated that the isolates 10, 25 and 27 were the m...