. >>> steven riley teaches about infectious diseases at imperial college in london. thanks for coming on. >> thanks for having me. >> that was a sobering report about the camp here in georgia. what might have indicate for what schools can face when they reopen in a few weeks? >> yes. the question about when and how to reopen schools is very difficult. this report from the summer camp shows you, when you get large groups of people together, whatever age, indoors, there's a risk of large amounts of transmission. the frequency with which this happens is difficult to figure out. but this is a great report that gives us detailed information. we have to remember that schools provide an awful lot of benefits over and above education. they provide physical safety and improve the well-being of the students. so, it's not as simple as just being able to choose to close schools because they're a transmission risk. it is a difficult question. >> it is a challenge for all of the school districts, all over this country. were you surprised, professor, at the percentage of the camp,