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Hum Vaccin Immunother ; 9(7): 1430-7, 2013 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-23571172


Enterovirus 71 (EV71) is one of the major causative agents for hand, foot and mouth disease (HFMD) in childhood. Nowadays, HFMD or EV71 infections have already become an important public health issue throughout the world. Vaccination may be the most effective measure to control the transmission of the virus. Therefore, to pave EV71 vaccine into human clinical trial, in the present study a comprehensive preclinical safety assessment of inactivated EV71 vaccine including single- and repeat-dose toxicity studies were conducted in rats and cynomolgus monkeys. No abnormal findings were observed in rats following single intramuscular administration with EV71 vaccine (640 U). The results also showed no obvious systemic toxicities from four repetitive intramuscular injections, with a 14-d interval, of two dosages of EV71 vaccine in the two animal species. Antinuclear antibody response was not detected after the repeated administrations. Histopathological examination demonstrated the minimal to severe inflammatory changes in muscle tissues of the injection sites in EV71 vaccine-injected animals and most of findings have been improved over time. Furthermore, test article could induce highly EV71-specfic neutralizing antibody response in both animal species. Taken together, these data suggested a favorable safety profile for inactivated EV71 vaccine and supported this product to enter human phase I clinical trial.

Enterovirus Humano A/imunologia , Doença de Mão, Pé e Boca/imunologia , Doença de Mão, Pé e Boca/prevenção & controle , Vacinas Virais/efeitos adversos , Vacinas Virais/uso terapêutico , Animais , Anticorpos Antinucleares/sangue , Anticorpos Neutralizantes/sangue , Anticorpos Antivirais/sangue , Feminino , Macaca fascicularis , Masculino , Ratos , Ratos Wistar , Vacinas de Produtos Inativados/efeitos adversos , Vacinas de Produtos Inativados/imunologia , Vacinas de Produtos Inativados/uso terapêutico , Vacinas Virais/imunologia
Artigo em Chinês | MEDLINE | ID: mdl-15640863


OBJECTIVE: To evaluate the RT-PCR-ELISA method applied for testing live attenuated hepatitis A vaccine titer. METHODS: A solid phase hybridization-enzyme colorimetric detection method was used for detecting specific nucleic acid. Primer labeled with biotin was used to amplify viral gene fragment, then the product was quickly hybridized with the specific probe covalently coupled on DNA-binding microplate wells. Finally, peroxidase-labeled streptavidin was used in colorimetric detection. The results were judged by reading A value. Eleven batches of live attenuated hepatitis A vaccine titer were tested by this method. The results were compared with that of routine cell culture method (CCID50). RESULTS: The sensitivity was similar to routine cell culture method (P>0.05). This method was convenient, fast and specific. CONCLUSION: CCID50 method may be replaced by the RT-PCR-ELISA method in evaluating the titer of live attenuated hepatitis A vaccine.

DNA Viral/análise , Vacinas contra Hepatite A , Vírus da Hepatite A/genética , Sequência de Bases , Ensaio de Imunoadsorção Enzimática , Genes Virais , Controle de Qualidade , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Sensibilidade e Especificidade , Vacinas Atenuadas