Study of the association between histo-blood group antigens and norovirus infection in Chinese children

Area of Science:

• Virology
• Gastroenterology
• Public Health

Background:

• Human caliciviruses (HuCVs) are a significant cause of acute viral diarrhea in children.
• Norovirus genotype GII.4 is the most common cause of HuCV infections.
• Host factors, such as secretor status and blood type, may influence susceptibility to HuCVs.

Purpose of the Study:

• To investigate the prevalence of HuCVs in children with acute diarrhea in China.
• To explore the association between HuCV infection and host factors like HBGA secretor status and blood type.
• To identify potential risk factors for specific norovirus genotypes.

Main Methods:

• Collection of stool and saliva samples from 295 children with acute diarrhea and 150 asymptomatic children.
• Detection of HuCVs using molecular methods.
• Analysis of host factors including HBGA secretor status and ABO blood group.

Main Results:

• HuCVs were detected in 10.85% of children with acute diarrhea, significantly higher than in asymptomatic children (1.33%).
• All HuCV-positive symptomatic children were either HBGA secretors (37.5%) or partial secretors (62.5%).
• A higher proportion of norovirus GII.3-positive children had blood type O (60%) compared to symptomatic patients overall (17.29%), suggesting a potential increased risk for type O individuals.

Conclusions:

• HuCVs are prevalent in children with acute diarrhea in China, with secretor status potentially playing a role in susceptibility.
• Blood type O may be associated with an increased risk of norovirus GII.3 infection.
• Further large-scale studies are warranted to confirm the association between blood type O and GII.3 infection risk.