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.
Science and environment report Alice Hutton has written an exceptionally lively and informative article for the UK Guardian newspaper about the International Quiet Ocean Experiment, a program on which we have worked hard and long:
ABSTRACT This article re-examines Jewish population in what is now Israel using historical estimates from Ottoman, Mandatory British and United Nations sources and recent data from the Israeli census bureau. A logistic model generates backward extrapolations and forward projections. The model quantifies three waves of Jewish immigration totalling about 3.5 million. Subtracting immigrant data from total population numbers gives the main empirical trajectory for non- immigrant native-born population. A multi-logistic model combining migrant and native populations projects a Jewish population of about 10 million in 2050, a level low in the range of estimates made by others.