MIT, Boston University, and Harvard Medical School researchers have identified weekly oscillations in the numbers of new daily COVID-19 cases and deaths in several countries that are more pronounced than fluctuations seen with other diseases.In their research letter, published today in JAMA Network Open, the authors describe how they analyzed daily new international coronavirus case and death data from the Worldometer for the United States, Germany, Canada, Italy, Brazil, and the United Kingdom from Feb 29 to Jul 2.In Germany and Italy, oscillations of new infections and deaths became less pronounced over time, with a 92% reduction from peak to peak in daily reported deaths from April to July, which the authors said could indicate