the purpose of this study was to survey infections with salmonella spp. in poultry flocks in the vicinity of tehran and to determine the most frequent serogroups and serotypes implicated. twenty-eight samples of pullet, layer, and broiler flocks were randomly collected (n=1463), including freshly dropped feces from live birds or visceral organs from dead birds. in most flocks, 60 samples were t...

Objective(s) Staphylococcus aureus is both a successful human commensal and a major pathogen. In this study we investigated the genetic diversity of 26 S. aureus isolates recovered from human skin and urinary tract infections. Materials and Methods Typing procedure for the studied S. aureus isolates was performed based on PCR amplification of the aroA gene, which encodes the enzyme 5-enolpyr...

The resistance phenotypes of nine potato cultivars to five isolates of Alternaria solani, causal agent of early blight, were studied after inoculation and growth under greenhouse conditions. We identified potato cultivars with both susceptible and resistant phenotypes as well as A. solani isolates with varying degrees of aggressiveness. Two potato cultivars and two pathogen isolates were select...

results among the specimens, 11 cases (1.4%) were culture-positive. among these isolates, only two isolates had high mic values for erythromycin and clarithromycin. pulsed-field gel electrophoresis analysis of the isolates revealed 6 pfge profiles (a-f) among which three and two isolates had the same patterns in profiles a and b, respectively. conclusions azithromycin can be a good drug of choi...

Thirteen isolates of Botryodiplodia theobromae collected from pear varieties grown in various regions of Punjab were studied for morphological, pathological and molecular characterization. The mycelial growth of B. theobromae isolates was classified as fluffy or depressed, uniform to irregular and cottony white turning to black. Colony growth rate varied from 19.1 to 24.9 mm per day. Pycnidia w...

sclerotinia stem rot (white stem rot), an important fungal disease, which is caused by sclerotinia sclerotiorum, is one of the serious diseases of various plants such as canola. use of resistant cultivars is an effective method to control the disease. a greenhouse experiment based on cotyledon inoculation using mycelial suspension of two different isolates of s. sclerotiorum was conducted to ev...

Soybean rhizobia were isolated from two soils with different cropping histories from Hubei province in central China. The first, from Honghu county, has been under soybean cultivation for decades. All of the isolates obtained from nodules on soybeans growing in this soil were fast-growing, acid-producing rhizobia. However, slow-growing, alkali-producing isolates were obtained at higher dilution...

thirty isolates of bacillus anthracis recovered from animal carcasses, soil and human in different localities in iran between 2007 and 2008. they were tested by standard disc diffusion susceptibility method for their resistant/ susceptibility to different kinds of antibiotics. according to american national committee of clinical laboratory standards (nccls) guidelines all isolates were sensi...

Migrations or introduction of new genotypes of Phytophthora infestans to a specific region imposes a different perspective for potato production. During 2009–2010, a late blight epidemic affected the Northeastern United States, which quickly spread through several states. The epidemic was characterized by the appearance of a new genotype of P. infestans designated US-22, which was isolated from...