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논문 기본 정보

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학술저널
저자정보
Lan Ngoc Vuong (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Tu Hoang Kim Trinh (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Tuan Diep Tran (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Duy Le Pham (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Vinh Nhu Nguyen (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Quan Tran Thien Vu (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Toan Duong Pham (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Phong Hoai Nguyen (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Minh Kieu Le (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Diem Dinh Kieu Truong (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Vu Anh Hoang (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Nghia Huynh (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam) Dat Quoc Ngo (University of Medicine and Pharmacy at Ho Chi Minh City, Vietnam)
저널정보
연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal Vol.65 No.9
발행연도
2024.9
수록면
501 - 510 (10page)
DOI
10.3349/ymj.2023.0567

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Purpose: Although some immune protection from close contact with individuals who have coronavirus disease 2019 (COVID-19) has been documented, there is limited data on the seroprevalence of antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals who were in lockdown with confirmed COVID-19 cases. This study investigated immunogenicity against SARS-CoV-2 in household members and people who lived near home-quarantined patients with COVID-19. Materials and Methods: This cross-sectional study was conducted during the community-based care that took place during lockdowns in District 10, Ho Chi Minh City, Vietnam from July to September 2021. SARS-CoV-2 antibody levels were determined in index cases of COVID-19, household contacts, and a no-contact group from the same area. Results: A total of 770 participants were included (355 index cases, 103 household contacts, and 312 no contacts). All index cases were unvaccinated, but >90% of individuals in the household and no-contact groups had received ≥1 vaccine dose. SARS-CoV-2 neutralizing antibodies (Nabs) were present in >77% of unvaccinated index cases versus 64%/65.4% in the household/no-contact groups (p=0.001). Antibody concentrations in unvaccinated index cases were significantly higher than those in household contacts and no contacts, with no difference between the latter groups. In all cases, antibody levels declined markedly ≥6 weeks after infection, and failed to persist beyond this time in the household and no-contact groups. Conclusion: Community-based care may have helped to create community immunogenicity, but Nabs did not persist, highlighting a need for vaccination for all individuals before, or from 6 weeks after, infection with SARS-CoV-2.

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