Cited by 42SARS-CoV-2 and COVID-19 ResearchCOVID-19 epidemiological studiesCOVID-19 Clinical Research Studies

Estimation of Secondary Household Attack Rates for Emergent Spike L452R Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Variants Detected by Genomic Surveillance at a Community-Based Testing Site in San Francisco

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Peng, James, Liu, Jamin, Mann, Sabrina A, Mitchell, Anthea M, Laurie, Matthew T, Sunshine, Sara, Pilarowski, Genay, Ayscue, Patrick +22 more·2022·Clinical Infectious Diseases

Published version of a preprint

Abstract

Background: Sequencing of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) viral genome from patient samples is an important epidemiological tool for monitoring and responding to the pandemic, including the emergence of new mutations in specific communities. Methods: SARS-CoV-2 genomic sequences were generated from positive samples collected, along with epidemiological metadata, at a walk-up, rapid testing site in the Mission District of San Francisco, California during 22 November to 1 December, 2020, and 10–29 January 2021. Secondary household attack rates and mean sample viral load were estimated and compared across observed variants. Results: A total of 12 124 tests were performed yielding 1099 positives. From these, 928 high-quality genomes were generated. Certain viral lineages bearing spike mutations, defined in part by L452R, S13I, and W152C, comprised 54.4% of the total sequences from January, compared to 15.7% in November. Household contacts exposed to the “California” or “West Coast” variants (B.1.427 and B.1.429) were at higher risk of infection compared to household contacts exposed to lineages lacking these variants (0.36 vs 0.29, risk ratio [RR] = 1.28; 95% confidence interval [CI]: 1.00–1.64). The reproductive number was estimated to be modestly higher than other lineages spreading in California during the second half of 2020. Viral loads were similar among persons infected with West Coast versus non-West Coast strains, as was the proportion of individuals with symptoms (60.9% vs 64.3%). Conclusions: The increase in prevalence, relative household attack rates, and reproductive number are consistent with a modest transmissibility increase of the West Coast variants. Summary: We observed a growing prevalence and modestly elevated attack rate for “West Coast” severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants in a community testing setting in San Francisco during January 2021, suggesting its modestly higher transmissibility.

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  • The Epsilon variant was estimated to be about 20% more transmissible than co-circulating lineages and to be associated with twofold higher upper-airway virus levels.

    “It was estimated to be about 20% more transmissible than co-circulating lineages and to be associated with twofold higher upper-airway virus levels 123,192 .”

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  1. Pilarowski G, Marquez C, Rubio L, et al. Field performance and public health response using the BinaxNOW TM Rapid SARS-CoV-2 antigen detection assay during community-based testing. Clin Infect Dis Off Publ Infect Dis Soc Am 2020; Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7799223/. Accessed 23 February 2021.
  2. Chamie G, Marquez C, Crawford E, et al. SARS-CoV-2 Community Transmission disproportionately affects Latinx population during Shelter-in-Place in San Francisco. Clin Infect Dis Off Publ Infect Dis Soc Am 2020; Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7499499/. Accessed 24 February 2021.

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Authors
Peng, J., Liu, J., Mann, S. A., Mitchell, A. M., Laurie, M. T., Sunshine, S., Pilarowski, G., Ayscue, P., Kistler, A., Vanaerschot, M., Li, L. M., McGeever, A., Chow, E. D., Marquez, C., Nakamura, R., Rubio, L., Chamie, G., Jones, D., Jacobo, J., Rojas, S., Rojas, S., Tulier-Laiwa, V., Black, D., Martinez, J., Naso, J., Schwab, J., Petersen, M., Havlir, D., DeRisi, J., & IDseq Team
Affiliations
  • University of California, San Francisco (US)
  • Stanford Medicine (US)
  • Chan Zuckerberg Biohub San Francisco (US)
  • California Department of Public Health (US)
  • United in Health (US)
  • University of California, Berkeley (US)
  • Chan Zuckerberg Initiative (United States) (US)
Corresponding author
DeRisi, Joseph
Venue
Clinical Infectious Diseases
Published
2021-03-31
Volume
74
Issue
1
Pages
32-39
ISSN
  • 1058-4838 (ISSN-L)
  • 1537-6591
OpenAlex
W3143386891
Cited by
41
References
44
Citations by year
2024: 1 · 2023: 8 · 2022: 14 · 2021: 18
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Clinical Infectious Diseases (publishedVersion, cc-by-nc-nd)
  • medRxiv (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-nd)
  • PubMed Central (submittedVersion, cc-by-nc-nd)
Funders
  • California Department of Public Health
  • Chan Zuckerberg Initiative
  • Stupski Foundation
  • National Institutes of Health
  • University of California, San Francisco
  • National Institute of General Medical Sciences (T32GM007810)
  • National Institute of Allergy and Infectious Diseases (F31AI150007, T32AI060530, T32AI060537, UM1AI069496)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
Keywords
SARS-CoV-2, COVID-19 pandemic, viral transmissibility, reproduction number, viral load, genomic surveillance, community-based testing, San Francisco

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