Instances, Information, and Surveillance


What COVID-19 Seroprevalence Surveys Can Inform Us

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What COVID-19 Seroprevalence Surveys Can Inform Us

Antibody towards SARS-CoV-2

Serology, or antibody, testing checks a pattern of an individual’s blood to search for antibodies towards SARS-CoV-2, the virus that causes COVID-19. Antibodies normally turn into detectable within the blood 1-3 weeks after somebody is contaminated.

Particular person contaminated → 1-3 weeks → individual has detectable stage of antibodies*

*Some individuals might take longer than 3 weeks to develop antibodies, and a few individuals might not develop antibodies. It’s presently unknown how lengthy antibodies are detectable after an infection.

A optimistic end result from this check might imply that an individual was beforehand contaminated with the virus.

Constructive (pattern optimistic for SARS-CoV-2 antibodies)

Adverse (Pattern destructive for SARS-CoV-2 antibodies)


The share of people in a inhabitants who’ve antibodies to an infectious agent is named seroprevalence.

Seroprevalence Survey

A seroprevalence survey makes use of antibody exams to estimate the proportion of individuals in a inhabitants who’ve antibodies towards SARS-CoV-2.

This may inform us how many individuals in a particular inhabitants might have been beforehand contaminated with SARS-CoV-2.

A small pattern of individuals collaborating within the survey represents a bigger inhabitants, which may very well be a neighborhood, state, or particular inhabitants (like healthcare staff or pregnant individuals).

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