AUTHOR=Garcia-Agundez Augusto , Ojo Oluwasegun , Hernández-Roig Harold A. , Baquero Carlos , Frey Davide , Georgiou Chryssis , Goessens Mathieu , Lillo Rosa E. , Menezes Raquel , Nicolaou Nicolas , Ortega Antonio , Stavrakis Efstathios , Fernandez Anta Antonio 

TITLE=Estimating the COVID-19 Prevalence in Spain With Indirect Reporting via Open Surveys

JOURNAL=Frontiers in Public Health

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2021.658544

DOI=10.3389/fpubh.2021.658544

ISSN=2296-2565

ABSTRACT=<p>During the initial phases of the COVID-19 pandemic, accurate tracking has proven unfeasible. Initial estimation methods pointed toward case numbers that were much higher than officially reported. In the CoronaSurveys project, we have been addressing this issue using open online surveys with indirect reporting. We compare our estimates with the results of a serology study for Spain, obtaining high correlations (R squared 0.89). In our view, these results strongly support the idea of using open surveys with indirect reporting as a method to broadly sense the progress of a pandemic.</p>