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Open Access Publications from the University of California

COVID-19 IgG/IgM antibody testing in Los Angeles County, California.

  • Author(s): Ahmad, Khadije
  • Rezvanizadeh, Vahid
  • Dahal, Suraj
  • Kinninger, April
  • Ghanem, Ahmed K
  • Lakshmanan, Suvasini
  • Hamal, Sajad
  • Flores, Ferdinand
  • Dailing, Christopher
  • Roy, Sion K
  • Budoff, Matthew J
  • et al.

Evidence suggests that asymptomatic and mild SARS-CoV-2 infections comprise > 95% of all cases. Developing a test that indicates past infection and possible immunity against the virus is important. We administered 244 antibody tests to three groups of high-risk population. The test consisted of an IgG component and an IgM component. The overall IgM/IgG positivity for patients with none, mild, moderate, and severe symptoms were 21.1%, 21.8%, 14.2%, and 26.9%, respectively. Those with moderate or severe symptoms were no more or less likely to have positive antibody tests than those with no or mild symptoms.

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