The main features of enteroaggregative Escherichia coli (EAEC) pathogenesis include attachment of bacteria to the intestinal mucosa, production of various toxins and cytotoxins, and stimulation of mucosal inflammation. 'Virulence' genes encode these features. Comparison of different EAEC isolates has shown that the virulence gene content of these isolates varies considerably. The heterogeneity ...

Taumetopoea pityocampa (Den. and Schiff) is one of the most common defoliator insects found in Turkey. Although several methods have been used in attempting to control this major forest pest up to now but the problem still remains largely unsolved in Turkey. There is an urgent need to control and minimize the damages caused by these defoliating caterpillars. Therefore, we planned and applied fi...

Professor and Instructor of Biological Sciences, respectively, at Pontificia Universidad Católica de Chile. Casilla 114-D, Santiago, Chile. Abstract: Native and exotic mammals have different effects on the matorral vegetation. (A) Large mammals (guanacos vs goats) differ in that native guanacos are only minor browsers, whereas goats use shrubs more extensively. Differences between goats and shr...

Cercospora leaf spot of olives is a serious defoliating disease attributed to Pseudocercospora cladosporioides. Although the disease is well distributed throughout olive growing regions of the world, its epidemiology and population structure remains unknown. The aim of this study was to establish the genetic variability of Spanish isolates of P. cladosporioides using DNA sequence data from the ...

We describe a new atypical Shiga-toxin-producing Escherichia coli (STEC) responsible for a severe episode of haemolytic-uraemic syndrome in an adult with a relapse associated with bacteraemia. This STECs train of serotype O80:H2 harboured stx2c and stx2d gene subtypes, the rare eae ξ variant and a ColV plasmid with a conserved virulence plasmidic region involved in virulence of human and avian ...

Potato virus Y group C isolates (PVYC) have been characterized according to biological, molecular and genetic criteria. Two genetic strains, PVYC1 and PVYC2, were identified on the basis of genetic distances (among them and other PVY strains), host range (ability or inability to infect pepper), MAb response (ELISA recognition with MAb 10E3) and coat protein processing site. Some characteristics...

During a 3-year surveillance study for avian influenza virus (AIV) infections at the Jeziorsko reservoir in central Poland, 549 oropharyngeal or cloacal swabs from 366 birds of 14 species belonging to 3 orders (Anseriformes, Charadriiformes and Gruiformes) were tested. AIV was detected in 14 birds (3.8%): Common Teals (12x), Mallard (1x) and Garganey (1x). Three potentially dangerous H5 AIV wer...