Hepatitis B Virus Exposure, Seroprotection Status, and Susceptibility in Health Care Workers From Lao People's Democratic Republic: Cross-Sectional Study.

HBsAg prevalence increased with age from 3.6% (9/248) in those aged ≤30 years to 6.8% (8/118) in those aged ≥50, although this also did not reach statistical significance ( P =.10; Table 1 and Multimedia Appendix 1 ).

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