RESUMO
The presence of IgG and IgM antibodies in the venous blood of 76 patients with confirmed COVID-19 infection was determined by ELISA using Russian test systems. Different levels of IgM antibodies to N-protein and receptor binding domain of the Spike protein (RBD) were revealed. The dynamics of IgG antibodies to the whole virion antigen and recombinant antigens showed high values on weeks 4-5 of the disease. The level of IgG antibodies to Nprotein remained low throughout the observation period. The characteristic dynamics of IgG measured using test systems with sorbed whole virion or recombinant spike proteins reflects the duration of the disease.
Assuntos
Anticorpos Antivirais/sangue , Antígenos Virais/imunologia , COVID-19/diagnóstico , Proteínas do Nucleocapsídeo de Coronavírus/imunologia , Imunoglobulina G/sangue , Imunoglobulina M/sangue , Glicoproteína da Espícula de Coronavírus/imunologia , Antígenos Virais/genética , COVID-19/sangue , COVID-19/imunologia , COVID-19/virologia , Proteínas do Nucleocapsídeo de Coronavírus/genética , Ensaio de Imunoadsorção Enzimática , Humanos , Imunidade Humoral , SARS-CoV-2/imunologia , SARS-CoV-2/patogenicidade , Glicoproteína da Espícula de Coronavírus/genética , Fatores de Tempo , Vírion/genética , Vírion/imunologiaRESUMO
The bactericidal activity of recombinant endolysins LysECD7, LysAm24, LysAp22, LysSi3 and LysSt11 was assayed in multidrug resistant strains (n=120) of Salmonella enterica, E. coli, Acinetobacter baumannii, Enterobacter spp., Pseudomonas aeruginosa, Klebsiella pneumoniae, and Campylobacter jejuni. The assay showed that the recombinant endolysins had a wide spectrum of bactericidal activity compared to endolysins of their progenitor phages. Among examined endolysins, we selected the active pharmaceutical substances with broad spectrum of bactericidal activity. Most strains were sensitive to LysECD7 (70.7%), LysAm24 (65%), and LysAp22 (58.6%), which seems to be promising causative agents for the development of finished dosage form.
Assuntos
Antibacterianos/farmacologia , Bacteriófagos/metabolismo , Endopeptidases/farmacologia , Acinetobacter baumannii/efeitos dos fármacos , Farmacorresistência Bacteriana Múltipla , Escherichia coli/efeitos dos fármacos , Klebsiella pneumoniae/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Pseudomonas aeruginosa/efeitos dos fármacosRESUMO
Pharmacokinetics of suppository forms of bacteriophages was studied on male Chinchilla rabbits. Suppositories with various composition of bacteriophages were administered once per rectum to rabbits, and the presence of phage particles was estimated in the blood, urine, and feces over 24 h. Pharmacokinetic study showed that the phages were detected in the blood, urine, and feces at various terms of the experiment irrespective of the size of viral particles, which confirmed the possibility of their systemic effects after rectal administration. Thus, the use of suppository form of bacteriophages can ensure the presence of phage particles even in infection foci that cannot directly contact with the preparation.
Assuntos
Bacteriófagos/isolamento & purificação , DNA Viral , Fezes/virologia , Administração Retal , Animais , Bacteriófagos/metabolismo , Disponibilidade Biológica , DNA Viral/sangue , DNA Viral/urina , Masculino , Coelhos , Supositórios/administração & dosagemRESUMO
We studied antibacterial properties of organo-inorganic hybrid coatings on the AMg2 aluminum alloy including superhydrophilic and superhydrophobic nanotextured metal substrates with applied bacteriophage particles. Bactericidal activity of surfaces after artificial contamination with a bacterial suspension was evaluated. To increase bactericidal effect of the plates, bacteriophage was sorbed on their surface. In the experiments simulating possible spreading of HAI pathogens, higher bactericidal activity of superhydrophilic surfaces in comparison with superhydrophobic ones. Application of bacteriophage particles did not prevent primary colonization of textured metal surfaces by strains used in the experiment, but in some cases increases their bactericidal activity.
