32. DESCRIPTION OF THE EPIDEMIOLOGICAL CHARACTERISTICS OF COVID-19 AND THE CAPACITY TO TRACK CLOSE CONTACTS OF THE DISEASE IN VAN DON DISTRICT, DONG TRIEU TOWN, QUANG NINH PROVINCE IN 2021. YHCĐ 2025, 66 (CĐ3-HNKH Ký Sinh Trùng VN lần thứ 51). https://doi.org/10.52163/yhc.v66iCĐ3.2153.