PMC:2854337 / 12941-13453 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/2854337","sourcedb":"PMC","sourceid":"2854337","source_url":"https://www.ncbi.nlm.nih.gov/pmc/2854337","text":"Two kind of untraceable casual contact groups were considered: a low-risk group who came into contact with other people at markets, in the neighborhoods, etc. and a high-risk group who used public transportation facilities, such as crowded trains and buses. The ratio of high-risk casual contact groups was set at 38% on average in all casual contact groups based on a census of the mode of transportation [29]. All casual contact groups were composed afresh twice a day with a size of 20 individuals on average.","tracks":[]}