Herd immunity is not a realistic exit strategy during a COVID-19 outbreak

Author:

Slot Ed1,Hogema Boris M.1,Reusken Chantal B.E.M.2,Reimerink Johan H.2,Molier Michel1,Karregat Jan H.M.1,IJlst Johan3,Novotný Věra M.J.4,Lier René A.W. van5,Zaaijer Hans L.6

Affiliation:

1. Sanquin Research

2. National Institute for Public Health and the Environment

3. Sanquin Laboratory Services

4. Sanquin Blood Bank

5. University of Amsterdam

6. Amsterdam UMC

Abstract

Abstract The world is combating an ongoing COVID-19 pandemic1-4. Health-care systems, society and the economy are impacted in an unprecedented way. It is unclear how many people have contracted the causative coronavirus (SARS-CoV-2) unknowingly. Therefore, reported COVID-19 cases do not reflect the true scale of outbreak5-9. Natural herd immunity has been suggested as a potential exit strategy during COVID-19 outbreaks, which may arise when 50-67% of a community has been infected10. Here we present the prevalence and distribution of antibodies to SARS-CoV-2 in a healthy adult population of a highly affected country using a novel immunoassay, indicating that one month into the outbreak (i) the seroprevalence in the Netherlands is 2.7% with substantial regional variation, (ii) the hardest-hit areas show a seroprevalence of up to 9.5%, (iii) the seroprevalence is sex-independent throughout age groups (18-72 years), (iv) antibodies are significantly more often detected in younger people (18-30 years), and (v) the number of immune individuals in the current epidemic stage is far below the herd immunity threshold. This study provides vital information on the extent of virus spread in a country where social distancing is in place, concluding that herd immunity to SARS-CoV-2 is not a realistic short-term exit strategy option.

Publisher

Research Square Platform LLC

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