Background: Rotavirus vaccines used to prevent acute diarrhea among children under 5 years old. In Vietnam, with the assistance of the World Health Organization (WHO), Centers for disease control and prevention (CDC), Atlanta, United States, Ministry of Health and Ministry of science and technology researched to create rotavirus master seed G1P8 which would use to produce Rota virus in Vietnam. Objectives: to evaluate titre and safety of rotavirus master seed G1P8 in vitro and in experimental animals. Subjectives and Method: experimental studies in vitro and experimental animals. Rotavirus master seed G1P8 (KH0118) series 1 (MS-P5) and series 2 (MS-P5) produced in 2005, preserved 80oC, were determined by immunofluorescence method (with unit of FFU/ml). The strains were tested in experimental animal\u2019s safety like the safe requirements of World Health Organization on live-attenuated vaccine (OPV). Results: no detection for exotic virus strains in virus suspension by PCR and titres of rotavirus master seed were similar and were more than 107 FFU / ml. 10 intervened rabbits were healthy life during follow up period, 8/10 these rabbits increased weight after follow up period, only two rabbits reduced weight but increase of mean weight of all 10 rabbits was 106%. 5 intervened guinea-pig increased mean weight (158%) and healthy during follow-up period. 4 experimental white mice increased mean weight (195%), higher than control groups. It was safety in experimenting on baby mice. Conclusions: two lots of rotavirus master seed G1P8 produced in POLYVAC had high titre and safety both in vitro and in experimental animals.
Rotavirus ;

No abstract available.
Humans* ; Rotavirus Infections* ; Rotavirus*

Epidemiological surveillance of rota virus diarrhoea in Vietnam during the period from August 1998 to December 2002
Diarrhea ; Rotavirus ; Rotavirus Infections

No abstract available.
Korea* ; Rotavirus*

No abstract available.
Korea* ; Rotavirus*

No abstract available.
Gastroenteritis* ; Rotavirus

Background: Rotavirus is the main cause of acute viral gastroenteritis in children under 5 years old. In Viet Nam, about 50-70% hospitalized children with acute diarrhea caused by rotavirus. This indicated the importance of vaccination against diarrhea in Vietnam and researching on creating safe diarrhea vaccine for infants was a imperative. To achieve a good result of the research, it\u2019s necessary to understand the genetic characteristics of rotavirus.Objectives: To determine sequencing of VP4, VP7, NSP1, NSP4 genes of human rotavirus strain G4P6. Subjects and method: The research was performed on rotavirus samples (203pp16TK; 203pp27TK; 203pp30vero; 203pp37vero; 203pp38vero lot11; 203pp38TK lot12) by using ARN separation and RT-PCR methods. Results and Conclusion: We presented the results of sequencing of VP4, VP7, NSP1, NSP4 genes in some passages of human rotavirus strain G4P6 including their deduced amino acid sequence. The nucleotide mutants of VP7, NSP4 genes of passages are 2, 1 respectively. All the mutants result in amino acid changes. There was no mutation on VP4, NSP1 genes. The result confirmed that all passages of human rotavirus strain G4P6 had no contamination. They had similar degree respectively 89-93%, 85-97%, 81-93%, 92-95% with strains in the world.
Rotavirus/ pathogenicity

Background: Rotavirus induced diseases is most commonly seen in children between 6 and 36 months old. In developing countries, rotavirus is also a common cause of gastrointestinal inflammation in below 2 years old children. Study on production of vaccine strains is a target that the World Health Organization is providing. Objective: To determine the quantity of different nucleotide and amino acids of genes 4, 6, 9, 10 of the Vietnam seed lot system and vaccine G1P8, G1P4 and G4P6. Subject and methods: By sequence method determine the quantity of different nucleotide and amino acids of gene 4 (VP4), gene 6 (VP6), gene 9 (VP7) and gene 10 (NSP4) of the Vietnam seed lot system and vaccine G1P8 (KH0118), G1P4 (2001019210) and G4P6 (2001019203) in comparison with international standard wild strains such as Ku, DS1, ST3, Hochi, TB-chen. Results and Conclusion: Each strain had a different nucleotide and amino acid sequence and it was characterized by each country. However, these strains had the same general chemical components including nucleic acid and protein. Nucleic acid was a double fiber ARN with 11 genes, and 18 thousand base pairs. 3 proteins with specific antigens were VP4, VP6 and VP7. 57 nucleotide of gene 4 (VP4) of the seed lot system G1P8 were different with Ku (AB22772) strain but there were only 17 different amino acids. For gene 7 (VP7), 70 nucleotide were different between G1P8 strain and Ku (AB222784) strain but there were 15 different amino acids. For gene 6 (VP6), although 141 nucleotide were different between G1P8 strain and Ku (AB222784) strain but there were only 9 different amino acids. For gene 10 (NSP4), 62 nucleotide were different between G1P8 strain and Ku strain (AB222772), making 12 different amino acids.
rotavirus vaccine

Rotavirus is one of the major causes of pediatric gastroenteritis and diarrhea. Based on the Rota/Adeno combistick one-step test for rotavirus and adenovirus in human feces, the authors studied causes of pediatric diarrhea. Some results: the rate of diarrhea induced Rotavirus accounted for 64.4%, mainly in children under 2 year of age. The highest prevalence of the rotavirus diarrhea is experienced in cool months of the year. Clinical symptoms were diarrhea and vomiting. Vomiting presented in 54.9% of cases.
Diarrhea ; Rotavirus

No abstract available.
Humans* ; Rotavirus*