From May to December 1997, 18 cases of mild to severe respiratory illness caused by avian influenza A (H5N1) viruses were identified in Hong Kong. The emergence of an avian virus in the human population prompted an epidemiological investigation to determine the extent of human-to-human transmission of the virus and risk factors associated with infection. The hemagglutination inhibition (HI) ass...

Three types of phenotypic expression of β-lactam resistance have been reported in methicillin-resistant Staphylococcus aureus (MRSA): heterogeneous, homogeneous, and Eagle-type resistance. Heterogeneous-to-homogeneous conversion of β-lactam resistance is postulated to be caused by a chromosomal mutation (chr*) in addition to the expression of the mecA gene. Eagle-type resistance is a unique phe...

PODCAST INTERVIEW with:Rachel LegmannDirector of Technology, Gene Therapy Rachel has more than 25 years experi...

Staphylococcus epidermidis is one of the most important opportunistic pathogens in nosocomial infections. The main pathogenicity associated with S. epidermidis involves the formation of biofilms on implanted medical devices, biofilms dramatically decrease the efficacy of conventional antibiotics and the host immune system. This emphasizes the urgent need for designing novel anti-staphylococcal ...

Sequences from -3500 to +1365 of the chicken histone H5 gene have been analyzed for the presence of cis-acting elements in H5 expressing (transformed CFU-E) and non-expressing cells (fibroblasts). The region from -3500 to -115 had little effect on transcription. Proximal upstream sequences contain a negative element (UNE, -115 to -95), capable to also repress the activity of the heterologous HS...

The rapid outbreak of the highly pathogenic H5N1 avian influenza virus and its transmission to humans have induced world-wide fears of a new influenza pandemic. The most effective method for the reduction of the impact of such a pandemic would be prophylaxis with a safe and effective vaccine, as well as anti-viral materials. In this study, we generated the specific antibodies 'immunoglobulin yo...

Total chicken erythrocyte histones were separated by reversed-phase h.p.l.c. using a multi-step acetonitrile gradient in a very short time (35 min). The proteins were eluted in the following order: H1, H5, H2B, H2A.2, H4, H2A.1 and H3.2. Applying a special gradient system adapted for the separation of very-lysine-rich histones, chicken erythrocyte H5 was resolved into two subfractions. Their el...

Highly pathogenic avian influenza H5N1 viruses have devastated the poultry industry in many countries of the eastern hemisphere. Occasionally H5N1 viruses cross the species barrier and infect humans, sometimes with a severe clinical outcome. When this happens, there is a chance of reassortment between H5N1 and human influenza viruses. To assess the potential of H5N1 viruses to reassort with con...

Mature and immature chicken erythrocyte nuclei were treated with activated aflatoxin B1 (2,3-dichloroaflatoxin B1), producing covalently bound DNA adducts. This reaction produces alkali-labile sites in the DNA which can be identified by using a variation of the Maxam-Gilbert sequencing procedure. We determined the aflatoxin B1 accessibility of defined regions of the erythroid genome by using di...

AIM This study was carried out to monitor avian influenza (AI) infection in wild birds in Egypt. MATERIALS AND METHODS A total of 135 wild birds were examined for the presence of H5, H7, and H9 hemagglutination inhibition antibodies. Organs and swab samples of 75 birds were screened by multiplex real-time reverse transcriptase-polymerase chain reaction (RRT-PCR) to detect AI subtypes H5, H7, ...