Author(s)
Daniel Stadlbauer
Published 9 Projects
COVID-19 Coronavirus SARS-CoV-2 Epidemiology Infectious Diseases
Russell P Tracy
Published 5 Projects
genomics Infectious Diseases Genetics Genetic And Genomic Medicine
Content
Video Abstract (AI generated) (02:42) Paper PreprintBackground: The risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) subsequent infection among seropositive young adults was studied prospectively. Methods: The study population comprised 3,249 predominantly male, 18-20-year-old Marine recruits. Upon arrival at a Marine-supervised two-week quarantine, participants were assessed for baseline SARS-CoV-2 IgG seropositivity, defined as a 1:150 dilution or greater on receptor binding domain and full-length spike protein enzyme-linked immunosorbent (ELISA) assays. SARS-CoV-2 infection was assessed by PCR at initiation, middle and end of the quarantine. After appropriate exclusions, including participants with a positive PCR during quarantine, we performed three biweekly PCR tests in both seropositive and in seronegative groups once recruits left quarantine and entered basic training and baseline neutralizing antibody titers on all subsequently infected seropositive and selected seropositive uninfected participants. Findings: Among 189 seropositive participants, 19 (10.1%) had at least one positive PCR test for SARS-CoV-2 during the six-week follow-up (1.1 cases per person-year). In contrast, 1,079 (48.0%) of the 2,247 seronegative participants tested positive (6.2 cases per person-year). The incidence rate ratio was 0.18 (95% CI 0.11-0.28, p<0.00001). Among seropositive recruits, infection was associated with lower baseline full-length spike protein IgG titers (p<0.0001). Compared with seronegative recruits, seropositive recruits had about 10-fold lower viral loads (ORF1ab gene, p<0.005), and trended towards shorter duration of PCR positivity (p=0.18) and more frequent asymptomatic infections (p=0.13). Among seropositive participants, baseline neutralizing titers were detected in 45 of 54 (83.3%) uninfected and in 6 of 19 (31.6%) infected participants during the 6 weeks of observation (ID50 difference p<.0001). Interpretation: Seropositive young adults had about one-fifth the risk of subsequent infection compared with seronegative individuals. Although antibodies induced by initial infection are largely protective, they do not guarantee effective SARS-CoV-2 neutralization activity or immunity against subsequent infection. These findings may be relevant for optimization of mass vaccination strategies.
More Projects
Loren Frank
13 views • 2 years ago
Global Immunotalks
390 views • 3 years ago
Laurel Yohe
2 views • 2 years ago
Global Immunotalks
130 views • 3 years ago
Jignesh H. Parmar
0 views • 2 years ago
Winston A. Haynes
0 views • 2 years ago
Noam Mazor
0 views • 2 years ago
Global Immunotalks
182 views • 3 years ago
Cem Yuksel
345 views • 3 years ago
Oscar Gonzalez-Recio
3 views • 2 years ago
Please pick a style:
Florian Krammer. (2021, Oct 30).SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study[Video]. Scitok. https://scitok.com/project/p/6dc1794d
G Letizia Andrew. "SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study" Scitok, uploaded by Krammer Florian, 30 Oct, 2021, https://scitok.com/project/p6dc1794d
Florian Krammer. "SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study" Scitok. (Oct 30, 2021). https://scitok.com/project/p/6dc1794d
Florian Krammer (Oct 30, 2021). SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study Scitok. https://scitok.com/project/p/6dc1794d
Florian Krammer. SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study[video]. 2021 Oct 30. https://scitok.com/project/p/6dc1794d
@online{al2006link, title={ SARS-CoV-2 seropositivity and subsequent infection risk in healthy young adults: a prospective cohort study }, author={ Krammer, Florian }, organization={Scitok}, month={ Oct }, day={ 30 }, year={ 2021 }, url = {https://scitok.com/project/p/6dc1794d}, }