Quoting a paper titled Science Forum: SARS-CoV-2 COVID-19 by the numbers written by Yinon M Bar-On, Avi Flamholz, Rob Phillips, Ron Milo of the same University, Milo, in a quick FAQ handout, states that the approach was tried by the Austrian school system with a variant—five days of school every two weeks in two groups, starting May 18, 2020; Mexico city announced reopening the economy with a 4-10 cyclic strategy, beginning the second half of June 2020. Several companies have adopted the approach e.g. Mastercard, with over 10,000 employees.

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On the benefits of this approach versus fully reopening the economy, he says: "The risk of a second wave of the epidemic is higher when fully reopening the economy. In the right conditions, the cyclic strategy can prevent a second wave that will necessitate going back to full lockdown. In some cases, the cyclic strategy can provide workers more confidence to return to work [more protection from infection from co-workers] than a full reopening. This was found, for example, in a hospital ward that used a cyclic strategy with several groups."

Ron Milo

The biologist says that the infectious period is shorter than the overall duration of illness, which lasts a few weeks for those with severe symptoms. "People usually stop being strongly contagious well before they recover from the disease. Moreover, severe and moderate cases are hospitalised or quarantined at home, and thus away from work. After 10 days, most people are much less infectious." Of course, those who show symptoms of COVID-19 should stay in quarantine or isolation until recovered.

Milo says that they recommend an initial phase of two cycles, i.e. one month after which the situation can be assessed. The approach is adaptive, and so is based on monitoring of cases.

Outlining the conditions for implementing the strategy, he says it-s important to understand the reproduction number of the virus in the community R. The reproduction number is the number of people that one infected person will pass the virus on to, on average. While the 4-10 strategy was designed to be used when the R under lockdown is well below 1—they give the example of many countries in Europe in May 2020 when R equalled 0.6-0.8—and that R during work days is reduced from initial 3-4 to 1.5 or below "thanks to measures including physical distancing, masks and self-quarantine upon symptoms. These conditions seem to apply, for example, in many European countries".

However, he cautions that those who can, should still continue working from home. "In a way they are helping those that do not have that freedom and must work out of the house," says the statement, adding that people in high risk groups should follow health authority recommendations.

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