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Volume 27, Number 2—February 2021
Research Letter

Long-Term Humoral Immune Response in Persons with Asymptomatic or Mild SARS-CoV-2 Infection, Vietnam

Huynh Kim MaiComments to Author , Nguyen Bao Trieu, Trinh Hoang Long, Hoang Tien Thanh, Nguyen Dinh Luong, Le Xuan Huy, Lam Anh Nguyet, Dinh Nguyen Huy Man, Danielle E. Anderson, Tran Tan Thanh, Nguyen Van Vinh Chau, Guy Thwaites, Lin-Fa Wang, Le Van TanComments to Author , and Do Thai Hung
Author affiliations: Pasteur Institute, Nha Trang City, Vietnam (H.K. Mai, N.B. Trieu, T.H. Long, H.T. Thanh, N.D. Luong, L.X. Huy, D.T. Hung); Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam (L.A. Nguyet, T.T. Thanh, G. Thwaites, L.V. Tan); Hospital for Tropical Diseases, Ho Chi Minh City (D.N.H. Man, N.V.V. Chau); Duke-NUS Medical School, Singapore (D.E. Anderson, L.-F. Wang); Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK (G. Thwaites); SingHealth Duke-NUS Global Health Institute, Singapore (L.-F. Wang)

Main Article

Table

Demographics, travel history, contact history, clinical status, and outcome for participants in study of long-term humoral immune response in persons with asymptomatic or mild SARS-CoV-2 infection, Vietnam, 2020*

Patient no.† Age, y/sex Province Presumed exposure Symptoms developed Diagnosed Presumed incubation period, d Recent travel history Contact with confirmed patient Clinical status Hospital stay, d
1
 25/F
 Khanh Hoa
 Jan 14
Jan 18
 Jan 24
 4
 None
 1 of first 2 cases in Vietnam
 Sympt
 11
2
 42/M
 Ninh Thuan
 Feb 27–Mar 4
 Mar 9
 Mar 16
 5–14
 Malaysia
 Unknown
 Sympt
 16
3
 36/M
 Ninh Thuan
 Feb 27–Mar 4
 Mar 13
 Mar 17
9–15
 Malaysia
 Unknown
 Sympt
 15
4
 51/F
 Binh Thuan
 Feb 22–29
 Mar 5
 Mar 9
7–14
 USA
 Unknown
 Sympt
 25
5‡
 51/M
 Binh Thuan
 Mar 2–9
Mar 11
 Mar 11
 2–9
 None
 Husband of patient 4
 Sympt
 23
6‡
 64/F
 Binh Thuan
 Mar 2–10
 Asympt
 Mar 10
5–8
 None
 Domestic worker of patient 4
 Asympt
 31
7‡
 28/F
 Binh Thuan
 Mar 7
 Asympt
 Mar 10
3
 None
 Daughter-in-law of patient 4
 Asympt
 24
8‡
 28/M
 Binh Thuan
 Mar 2–9
 Mar 11
 Mar 11
 2–9
 None
 Son of patient 4
 Sympt
 23
9‡
 47/F
 Binh Thuan
 Mar 3–8
 Mar 11
 Mar 11
 3–8
 None
 Mother of patient 7
 Sympt
 23
10‡
 37/F
 Binh Thuan
 Mar 3–8
 Asympt
 Mar 10
2–7
 None
 Staff of patient 4
 Asympt
 24
11‡ 12/M Binh Thuan Mar 3–8 Asympt Mar 11 2–7 None Son of patient 10 Asympt 30

*All patients made a full recovery. No patients required oxygen. All patients were of Vietnamese nationality. First enrollment was on January 24, 2020, and last was on March 17, 2020. Last follow up was on August 13, 2020. Asympt, asymptomatic; sympt, symptomatic.
†Patient numbers match those in Figure 1.
‡Patients from a cluster involving 3 household transmission chains (Appendix Figure).

Main Article

Page created: November 13, 2020
Page updated: January 24, 2021
Page reviewed: January 24, 2021
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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