Samuel Clark

Characterizing COVID-19 Epidemic in Ohio


During 2020, a team of researchers from The Ohio State University conducted three projects to better understand the extent and effects of the COVID-19 epidemic in Ohio.

  1. A representative, state-wide prevalence study of adults to characterize ever- and currently-infected with the coronavirus,
  2. A state- and county-level excess deaths study to estimate the total mortality burden associated with the epidemic in Ohio, and
  3. A representative, weekly telephone survey to characterize the prevalence and trend in COVID-19 symptoms and protective behaviors.

COVID-19 Prevalence Study

The prevalence study used a sample survey that was conducted in July, 2020. Both ever-infected and currently-infected prevalence rates were low at that time. A publication describing the results in detail is under review now.

Existing statistical methods for the analysis of survey data were inadequate for the unusual data produced by the prevalence survey. Our team developed a new statistical approach to solve those challenges. A publication describing the new methods and their application to the survey data in detail is under review now and also available as an arXiv preprint,

I was invited to write a commentary for PNAS based on experience with the prevalence study, and I did that with Abigail Norris Turner who led the overall study. We highlight the need to improve response rates and to prepare a robust measurement capability to be ready for the next pandemic.

Excess Deaths Study

The excess deaths study is ongoing. For the state, results closely match those of the CDC, see CDC excess deaths report and data. County-level results reveal heterogeneity in both levels and timing of patterns of excess deaths.

Weekly Telephone Survey

Data from the weekly telephone survey were not as useful as we had hoped.

COVID-19 Routine Mortality Surveillance

In addition to the work in Ohio, I work closely with the NGO Vital Strategies on a project to develop a COVID-19 routine mortality surveillance (CRMS) tool based on the verbal autopsy method. This work is in progress with partners in Colombia and Brazil.

Updated 2021-03-24