Bioluminescence and 19F magnetic resonance imaging visualize the efficacy of lysostaphin alone and in combination with oxacillin against Staphylococcus aureus in murine thigh and catheter-associated infection models
Hertlein T.,University of Würzburg |
Sturm V.,University of Würzburg |
Lorenz U.,University of Würzburg |
Sumathy K.,Bharat Biotech International Ltd. |
And 2 more authors.
Antimicrobial Agents and Chemotherapy | Year: 2014
Staphylococci are the leading cause of hospital-acquired infections worldwide. Increasingly, they resist antibiotic treatment owing to the development of multiple antibiotic resistance mechanisms in most strains. Therefore, the activity and efficacy of recombinant lysostaphin as a drug against this pathogen have been evaluated. Lysostaphin exerts high levels of activity against antibiotic-resistant strains of Staphylococcus aureus, including methicillin-resistant S. aureus (MRSA). The therapeutic value of lysostaphin has been analyzed in two different clinically relevant in vivo models, a catheter-associated infection model and a thigh infection model. We infected mice with luciferase-expressing S. aureus Xen 29, and the efficacies of lysostaphin, vancomycin, oxacillin, and combined lysostaphin-oxacillin were investigated by determining numbers of CFU, detecting bioluminescent signals, and measuring the accumulation of perfluorocarbon emulsion at the site of infection by 19F magnetic resonance imaging. Lysostaphin treatment significantly reduced the bacterial burden in infected thigh muscles and, after systemic spreading from the catheter, in inner organs. The efficiency of lysostaphin treatment was even more pronounced in combinatorial therapy with oxacillin. These results suggest that recombinant lysostaphin may have potential as an anti-S. aureus drug worthy of further clinical development. In addition, both imaging technologies demonstrated efficacy patterns similar to that of CFU determination, although they proved to be less sensitive. Nonetheless, they served as powerful tools to provide additional information about the course and gravity of infection in a noninvasive manner, possibly allowing a reduction in the number of animals needed for research evaluation of new antibiotics in future studies. Copyright © 2014, American Society for Microbiology. All Rights Reserved.
Sumathy K.,Bharat Biotech International Ltd |
Ella K.M.,Bharat Biotech International Ltd
Journal of Medical Virology | Year: 2012
The genetic diversity of Chikungunya virus (CHIKV) causing recurring outbreaks in India since 2006 was studied. The 2006 epidemic was caused by a virus strain of the East, Central and South African (ECSA) genotype with 226A in the E1 glycoprotein. The variant strain with E1-A226V mutation caused outbreaks since 2007 in the state of Kerala where Aedes albopictus is the abundant mosquito vector. Molecular epidemiology data since 2007 is scarce from other regions of the country. RT-PCR, sequencing and phylogenetic analyses of CHIKV isolates from the 2009 to 2010 epidemics in the States of Tamil Nadu and Andhra Pradesh placed them in a separate clade within the ECSA lineage. The isolates of the study had 226A in the E1 glycoprotein. The isolates had a novel E1-K211E mutation that was under significant positive selection. E1-211E is highly conserved in the Asian genotype of the virus circulated by Aedes aegypti. Unique mutations in E2 glycoprotein were identified. The two sub-lineages of ECSA genotype circulating in India parallel the abundance of Ae. albopictus and Ae. aegypti. Novel mutations in the envelope glycoproteins suggest adaptive evolution of the virus to local vector abundance. Cross neutralization of the virus isolates from recurring Indian epidemics indicated that no distinct serotypes had evolved. The study has provided insights into the origin, distribution and evolutionary adaptation of the virus to local vector abundance in the region that has reportedly, the highest incidence of CHIKV infection in the world. © 2011 Wiley Periodicals, Inc.
Bharat Biotech International Ltd | Date: 2016-02-09
Bharat Biotech International Ltd | Date: 2016-02-09
Bharat Biotech International Ltd | Date: 2012-01-03
The invention provides a stable immunogenic composition for prevention and prophylaxis of infections caused by rota virus, poliomyelitis virus, Haemophilius influenza, Hepatitis B, Corynebacterium diphtheriae, Clostridium tetani, Bordatella pertusis (acellular) in a single combined vaccine. The invention also provides for a bivalent immunogenic composition against rota virus and polio virus. The process of making such compositions of the multivalent antigens are also disclosed. The present invention also relates to the production and use of such vaccines for prophylaxis against the infections mentioned above.
Bharat Biotech International Ltd | Date: 2013-04-23
Invention provides novel rotavirus vaccine compositions comprising rotavirus antigens, stabilizers and buffers. The buffers in the invention are pre-mixed in the rotavirus vaccine compositions to neutralize the high acidic pH of the stomach without requiring separate administration of an antacid before vaccine administration. Vaccine compositions with buffers of the invention are stable liquid rotavirus vaccine formulations for oral administration.
BHARAT BIOTECH INTERNATIONAL Ltd | Date: 2010-07-14
A synergistic pharmaceutical composition for the preparation of topical formulations for use in prophylaxis and treatment of wounds, burn wounds, skin grafts, pressure ulcers, diabetic foot ulcers and other skin diseases is provided. The composition may include one or more synergistically active ingredients and one or more inactive ingredients. The synergistically active ingredients may include Recombinant Human Epidermal Growth Factor (rh-EGF) (REGEN-D of Bharat Biotech International Limited) and/or Platelet Derived Growth Factor (rh-PDGF-BB), silver sulfadiazine (SSD) and chlorhexidine gluconate (CHG). One or more inactive ingredients may comprise carriers, preservatives, emulsifiers, skin emollients and soothers and one or more other constituents.
Bharat Biotech International Ltd | Date: 2016-07-18
The present disclosure provides vaccine compositions for prophylaxis and treatment of Zika virus infections comprising Zika virus antigens in immunogenic compositions, and in combination of Zika antigens with one or more arbovirus antigens such as Chikungunya virus and Japanese encephalitis virus antigens, methods of preparation and production of such compositions for use as vaccines for eliciting immune response in mammals against the above mentioned pathogens.
Bharat Biotech International Ltd | Date: 2013-05-09
Vaccine combinations which comprise at least two or more of the following antigens: DTap-HEV-HepB-HPV suitable for administration in humans. A number of variations in the combination of these antigens have been disclosed that is suitable for concomitant administration. The methods of preparing the vaccine combinations are disclosed. Nucleic acids encoding the antigens, as well as methods for their production and use are provided.
BHARAT BIOTECH INTERNATIONAL Ltd | Date: 2010-01-25
Compositions and methods related to live or live attenuated pre-conditioned and typical viruses such as rotaviruses are disclosed. The live attenuated rotaviruses exhibit better stability characteristics and are useful for the prevention of a rotavirus infection and/or rotavirus gastroenteritis in children.