Temperature and latitude do not appear to be associated with the spread of coronavirus disease 2019 (COVID-19), according to a study of many countries published in CMAJ (Canadian Medical Association Journal), but school closures and other public health measures are having a positive effect.
The Canadian study looked at 144 geopolitical areas — states and provinces in Australia, the United States and Canada as well as various countries around the world — and a total of more than 375 600 confirmed COVID-19 cases. China, Italy, Iran and South Korea were excluded because the virus was either waning in the case of China or in full disease outbreak at the time of the analysis in others.
