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Rotavirus diarrhea in Bangladeshi children: correlation of disease severity with serotypes
C Bern1, L Unicomb, J R Gentsch
1Viral Gastroenteritis Section, National Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333.
Insights
Rotavirus serotypes G2 and G3 were linked to more severe dehydration in Bangladeshi children. However, these differences may not be clinically significant, emphasizing the need for rotavirus vaccines covering all major G types.
Area of Science:
- Pediatrics
- Infectious Diseases
- Gastroenterology
Background:
- Rotavirus is a leading cause of severe diarrheal disease in young children globally.
- Understanding the clinical significance of different rotavirus serotypes is crucial for vaccine development and public health strategies.
Purpose of the Study:
- To investigate the association between rotavirus serotypes (G types) and clinical characteristics, including disease severity, in diarrheal episodes among young children in rural Bangladesh.
- To identify the prevalence of different rotavirus G and P types in this population.
Main Methods:
- A study of 2,441 diarrheal episodes in children under 2 years old in rural Bangladesh.
- Rotavirus G serotyping using oligonucleotide probes and P serotyping via polymerase chain reaction (PCR).
- Correlation analysis of clinical data (dehydration, vomiting, diarrhea, fever, pain, hospitalization) with identified rotavirus serotypes.
Main Results:
- Of 764 rotavirus-associated episodes, 485 were typed for G serotype (1, 2, 3, or 4), with 233 being nontypeable.
- Rotavirus G types 2 and 3 were associated with more severe dehydration compared to G types 1, 4, or nontypeable strains.
- No significant differences in vomiting, diarrhea, fever, abdominal pain, or hospital stay length were observed across G types.
- Rotavirus was detected in 12 children who died; malnutrition was more common in deceased children.
- PCR identified P types: P1 (72.5%), P2 (22.5%), P3 (2.5%), and nontypeable (2.5%).
Conclusions:
- While rotavirus G types 2 and 3 are associated with increased dehydration severity, the clinical differences are minor.
- Malnutrition is a significant risk factor for mortality in children with rotavirus diarrhea.
- Effective rotavirus vaccines should provide broad protection against the four major G types prevalent in the study area.
Abstract:
To improve the understanding of the relative importance of serotypes of rotavirus in dehydrating diarrhea, we examined the correlation of clinical characteristics and disease severity with serotype in 2,441 diarrheal episodes among children younger than 2 years of age in rural Bangladesh. Of 764 rotavirus-associated episodes, a single G type (serotype 1, 2, 3, or 4) was determined by oligonucleotide probe in 485 (63%), while 233 episodes were nontypeable. Episodes with G types 2 and 3 were associated with more-severe dehydration than episodes associated with G type 1 or 4 or with nontypeable rotavirus. Episodes did not differ by G type in prevalence of vomiting, copious diarrhea, fever, abdominal pain, or length of treatment center stay. Rotavirus reinfections were detected in seven children, with homologous reinfection (G type 2) in one. Twelve children with diarrhea who died had rotavirus detected in stool specimens within 30 days of death. Children who died were more likely to be malnourished than were surviving children with rotavirus diarrhea. Of 40 specimens tested by polymerase chain reaction, 29 (72.5%) were P type 1, 9 (22.5%) were P type 2, 1 (2.5%) was P type 3, and 1 (2.5%) was nontypeable. One severely symptomatic diarrheal episode was associated with P type 3 rotavirus, a serotype usually found in asymptomatic nursery infections. Although G types 2 and 3 were associated with more-severe dehydration than other serotypes, the differences do not appear to be of major clinical importance. Effective vaccines should protect against all four major G types.