Conclusion
Our study investigated for the first time the associations between several personal factors and RSV and RV-specific immune levels in a large population covering a wide age range. In children, older age, female sex and lower BMI were associated with higher RV-specific IgG levels, while no personal determinants were associated with RSV-specific IgG levels. In adults, age (older age for RSV, younger age for RV), active smoking and all seasons except summer were associated with higher RSV and RV specific IgG levels. Additionally, female sex and lower BMI were associated with higher RV specific IgG levels among adults. These results suggest that personal determinants of respiratory IgG immune responses might differ between children and adults and according to the respiratory virus considered.