Background: Rota vaccine is used to prevent diarrhea in children under 5 years old. Two vaccines are being used in developed countries: Rotarix (GSK) and RotaTeq (Merk). Rotarix vaccine was produced from master seed G1P8 and RotaTeq vaccine was from the coordination of human rotavirus strains G1, G2, G3, G4 and cow rotavirus strain. Thanks to the help of WHO, Ministry of Health and Ministry of Science and Technology, Center for research and production of vaccines and biologicals \ufffd?Ha Noi made study of creating rotavirus master seed G4P6 for Rota vaccine production in Vietnam. Objectives: To evaluate the safety and potency of rotavirus master seed G4P6 in the laboratory and experimental animals. Subjects and method: Rotavirus master seed G4P6 (2001019203) lot 1 (MS-PL5) and lot 2 (MS-PL5) produced in 2005, preserved at -800C were determined potency by Immunofluorescence (IF) method and tested for safety on rabits and rats. Results:2 lots of Rotavirus master seed G4P6 that had been produced in Center for research and production of vaccines and biologicals \ufffd?Ha Noi had high titre and safety in the laboratory and experimental animals. Conclusion: The results were the basis of Rota vaccine production in Vietnam.
Rotavirus/ isolation & ; purification ; Rotavirus Vaccines/ isolation & ; purification ; contraindications

Background: Rota vaccine is used to prevent diarrhea in children under 5 years old. Two vaccines are being used in developed countries: Rotarix (GSK) and RotaTeq (Merk). Rotarix vaccine was produced from master seed G1P8 and RotaTeq vaccine was from the coordination of human rotavirus strains G1, G2, G3, G4 and cow rotavirus strain.Thanks to the helps of WHO, Ministry of Health and Ministry of Science and Technology, Center for research and production of vaccines and biologicals \ufffd?Ha Noi made study of creating rotavirus master seed G1P4 for Rota vaccine production in Vietnam. Objectives: To evaluate the safety and potency of rotavirus master seed G1P4 in the laboratory and experimental animals. Subjects and method: Rotavirus master seed G1P4 (2001019210) lot 1 (MS-P5) and lot 2 (MS-P5) produced in 2005, preserved at -800C were determined potency by Immunofluorescence (IF) method and tested for safety on rabits and rats. Results:2 lots of Rotavirus master seed G1P4 that had been produced in Center for research and production of vaccines and biologicals \ufffd?Ha Noi had high titre and safety in the laboratory and experimental animals. Conclusion: The result was the basis of Rota vaccine production in Vietnam.
Rotavirus/ diagnostic use ; Rotavirus Vaccines/ isolation & ; purification ; contraindications

China ; epidemiology ; Genes, Viral ; Humans ; Polymerase Chain Reaction ; methods ; Rotavirus ; genetics ; isolation & purification ; Rotavirus Infections ; epidemiology ; virology

Rotavirus is the leading causal agent of severe acute gastroenteritis in children aged <5 years. A specific pharmacologic agent for the treatment of rotavirus-infected children is lacking. In China, only the Luo Tewei oral vaccine (Lanzhou Institute of Biological Products, Shanghai, China), which is produced from Lanzhou lamb rotavirus vaccine (LLR), is available. Studies have hypothesized that the genotype of LLR is G10P[12], To identify the genotype of LLR by reverse transcription-polymerase chain reaction, we showed that the VP7 and VP4 genotypes of LLR were G10 and P[15], respectively, based on sequencing, alignment and phylogenetic analyses. In conclusion, we identified the genotype of rotavirus strain LLR to be G10P[15].
China ; Genotype ; Humans ; Molecular Sequence Data ; Phylogeny ; Rotavirus ; chemistry ; classification ; genetics ; isolation & purification ; Rotavirus Infections ; virology ; Rotavirus Vaccines ; chemistry ; classification ; genetics ; isolation & purification ; Sequence Homology, Amino Acid ; Viral Proteins ; chemistry ; genetics

To develop a specific, rapid and convenient method based on molecular motor biosensor to detect food-borne rotavirus. A specific probe was encompassed the conservative region of rotavirus's VP7 segment, and a molecular motor detect device was constructed by connecting probes to F0F1-ATPase molecular motor through biotin-streptavidin system. This biosensor's sensitivity was 0.005 ng/mL for rotavirus RNA. Extracted virus RNA was conjugated with the biosensor separately, at the same time ATP was synthesized. By comparing fluorescence intensity, we can detect rotavirus RNA in samples. This method possessed specificity for rotavirus, without any cross-reaction with Hepatitis A virus and noroviris, and it could be accomplished within 1 h. We detected 15 samples using this method and the results were compared with RT-PCR results. This method is sensitive and specific for rotavirus, and it can be used to detect food-borne rotavirus.
Biosensing Techniques ; methods ; DNA, Viral ; analysis ; genetics ; Food Microbiology ; methods ; Rotavirus ; genetics ; isolation & purification ; Sensitivity and Specificity

Child ; Child, Preschool ; Diarrhea ; virology ; Female ; Genotype ; Humans ; Infant ; Male ; Rotavirus ; classification ; genetics ; isolation & purification ; Seasons

OBJECTIVETo learn the relationship between severity of rotavirus diarrhea and serotype G and genotype P.

METHODThe clinical information and fecal specimens of hospitalized children less than 5 years of age with acute diarrhea in four sentinel hospitals were collected from Aug 2001 to July 2003. Specimens were tested and typed for rotavirus. Each child with rotavirus infection was assessed for severity of diarrhea according to the 20-points scoring system of Vesikari.

RESULTSWhen combined with P[8], the severity scores for rotavirus diarrhea of P[8]G1 and P[8]G3 were 13 and 12 points, respectively, and the durations of diarrhea were 6 days and 5 days, respectively. The percentage of fever in patients with diarrhea caused by P[8]G1 was higher than that in those with diarrheas caused by P[8]G3 (97 percent vs. 73 percent). And the highest temperature in the cases with diarrheas caused by G1 and G3 was 39 degrees C and 38.6 degrees C, respectively. When combined with G3, the difference of diarrhea severity scores between P[4]G3 and P[8]G3 was not significant. But duration of diarrhea caused by P[4] was longer than that of diarrheas caused by P[8] (6.5 days vs. 5 days) and the maximum times of vomiting in P[8] cases was higher than in p[4] cases (4 times vs. 3 times per day). There was no significant difference in other clinical features between P[8] and P[4] infected cases.

CONCLUSIONWhen combined with P[8], RV diarrhea caused by G1 was associated with higher severity scores than diarrhea caused by G3. When combined with G3, there was no significant difference in severity scores between P[4] and P[8] infected cases.

Child, Preschool ; Diarrhea ; complications ; immunology ; pathology ; virology ; Female ; Fever ; etiology ; Genotype ; Humans ; Infant ; Male ; Rotavirus ; genetics ; immunology ; isolation & purification ; Rotavirus Infections ; complications ; immunology ; pathology ; virology ; Severity of Illness Index

OBJECTIVEStudy on the infection rate,influence factors and clinical characteristic of rotavirus diarrhea in children.

METHODS634 hospitalized diarrhea children was collected from 2006 June to 2010 October. The gold immunochromatographic double-antibody sandwiched assay was used to detect the antigen of Rotavirus directly. The age of onset, incidence, clinical features and multiple organ damage and other aspects were summarized and analyzed.

RESULTS308 cases was detected positively in the 634 specimens, the positive rate was 48.6%. In 6 to 12 months old children 197 cases was detected positively, accounted for 66.3%. Rotavirus was detected all the year round and the positive rate was higher in the first quarter and the forth quarter and was 63.8% and 62. 6% respectively. 68.6% accompanied with myocardial damage, 41.2% with lower respiratory tract infection, 13.3% with liver damage, 14.9% with renal damage, 9.4% with convulsions in 4.9%, accompanied by the damage of blood system.

CONCLUSIONRotavirus is the leading cause of pediatric diarrhea the main pathogens, 6-12 months infants with the highest infection rate, the first, the fourth quarter is higher. Rotavirus infection can cause multiple organ dysfunction.

Child, Preschool ; China ; Enteritis ; diagnosis ; epidemiology ; virology ; Female ; Humans ; Incidence ; Infant ; Male ; Rotavirus ; genetics ; isolation & purification ; Rotavirus Infections ; diagnosis ; epidemiology ; virology ; Seasons

OBJECTIVETo provide information on epidemiology of rotavirus infection in Beijing, China.

METHODSAn ongoing hospital-based surveillance was conducted among children < 5yr old with acute diarrhea according to WHO generic protocol (CID-98). During a 3-year study (Apr. 1998 to Mar. 2001), a total of 484 stool samples were collected from 1 457 patients, including 275 samples from 1 048 outpatients and 209 samples from 409 inpatients.

RESULTSThe overall detection rate of rotavirus infection was 25.4%. Rotavirus was responsible for 27.3% of diarrhea inpatients on a yearly base, and 46.2% during rotavirus season. Two peaks of diarrhea were observed each year, one in the summer (June-Sep.) due to bacterial dysentery (16.7%) and another in fall winter (Oct.-Dec.) due to rotavirus infection (23.0%). The detection rate on rotavirus was the highest in age group of 6 - 11 months (38.2%), followed by 1 - 2 years old (28.5%). Ninety six point eight percentage of children were infected under 3 years of age. The number of deaths, possibly caused by rotavirus diarrhea were accounted for 40% of all diarrhea deaths and 11.1% of the total deaths. Serotyping of 123 rotavirus isolates showed that serotype G1 (55.3%) was predominant, followed by G2 (26.8%), G3 (9.8%), G4 (0.8%), and 10 isolates (8.1%) remained non-typeable. Mixed infections (0.8%) seemed to be rare.

CONCLUSIONRotavirus diarrhea was an important infectious disease among children in Beijing. Safe and effective rotavirus vaccines for the prevention of severe diarrheas and the reduction of treatment costs are of significant importance to China.

Age Factors ; Child, Preschool ; China ; epidemiology ; Dysentery ; epidemiology ; etiology ; Female ; Hospitals ; statistics & numerical data ; Humans ; Infant ; Male ; Population Surveillance ; Rotavirus ; classification ; isolation & purification ; Rotavirus Infections ; complications ; epidemiology ; Serotyping

OBJECTIVETo investigate the epidemic of diarrhea caused by rotavirus infection among children treated at the Beijing Friendship Hospital in a period of 2 years.

METHODSStool samples were collected from 972 diarrheic children from January 2010 to January 2012. The antigen of rotavirus was detected by the gold imunochromatography assay (GICA).

RESULTAmong the samples studied, 370 out of 972 cases (38.1%) were positive for rotavirus antigen. The ratio of infected boys and girls was 2.14:1. Most infected children (91.4%) were under the age of two. The viral infection takes place all year round but breaks out mainly within a cold season that lasts from October through March, with a peak in November and December. Even in the spring and summer, however, its prevalence rates were quite significant among the children with diarrhea, ranging from 11.1% to 41.7%.

CONCLUSIONIn Beijing area, rotavirus is the major etiologic cause of diarrhea in children, especially in those under the age of 2. The peak prevalence occurs at any given time during the late fall and early spring seasons. It is necessary, therefore, to strengthen the surveillance of rotavirus infection in the spring and summer seasons in order not only to predict and prevent a potential outbreak in the end of the year, but also collect and provide more dynamic data for the further epidemiologic research of rotavirus diarrhea in the children.

Child, Preschool ; China ; epidemiology ; Diarrhea ; epidemiology ; virology ; Feces ; virology ; Female ; Humans ; Infant ; Male ; Prevalence ; Rotavirus ; genetics ; isolation & purification ; Rotavirus Infections ; epidemiology ; virology ; Seasons