Analysis of passengers who rode high speed trains in China from December to March found the risk of COVID-19 transmission related to travel time and proximity....
A review of 1308 studies looking at the prevalence of bacterial co-infection in 3448 patients with COVID-19 found 7.1% had bacterial co-infection overall.
The World Health Organization has published a document on "key considerations for national health authorities when considering or implementing the gradual return to international travel operations".