Published Open Access in Frontiers in Epidemiology: The Coronavirus Calendar (CoronaCal): a simplifiedSARS-CoV-2 test system for sampling and retrospective analysis by Manija A. Kazmi, David S. Thaler, Karina C. Åberg, Jordan M. Mattheisen, Thomas Huber and Thomas P. Sakmar
The paper concludes that sampling saliva on simple paper provides a useful method to study the natural history and epidemiology of COVID-19 (and probably many other microbes). The “CoronaCal” collection and testing method is easy to implement, inexpensive, non-invasive and scalable. The approach can inform the historical and epidemiological understanding of infections in individuals and populations.
The idea for the paper arose from efforts in the Leonardo Da Vinci DNA Project about stable preservation of genetic material on paper.