Travel routes to China, Italy and Iran contributed most to the spread of Covid-19.go from an outbreak in a single Chinese city to a global pandemic?
"We analysed reported travel to affected countries among the first cases reported from each country outside mainland China, demographic and exposure characteristics among cases with age or gender information, and cluster frequencies and sizes by transmission settings," wrote the researchers. The first affected African country was Algeria, and by 10 March, 13% of African countries were affected.
About 22% of first cases in countries had travelled to China, 11% to Iran, 27% to Italy and 15% to other affected countries. While the spread from these travellers was thought to be mostly clustered around household transmissions, the researchers found much higher spread in workplace and community settings. Many of the large clusters were attributed to faith-based gatherings, as well as healthcare settings, like hospitals.
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