Group items tagged

Case isolation and contact tracing can contribute to the control of COVID-19 outbreaks1,2. However, it remains unclear how real-world social networks could influence the effectiveness and efficiency of such approaches. To address this issue, we simulated control strategies for SARS-CoV-2 transmission in a real-world social network generated from high-resolution GPS data that were gathered in the course of a citizen-science experiment3,4. We found that tracing the contacts of contacts reduced the size of simulated outbreaks more than tracing of only contacts, but this strategy also resulted in almost half of the local population being quarantined at a single point in time. Testing and releasing non-infectious individuals from quarantine led to increases in outbreak size, suggesting that contact tracing and quarantine might be most effective as a 'local lockdown' strategy when contact rates are high. Finally, we estimated that combining physical distancing with contact tracing could enable epidemic control while reducing the number of quarantined individuals. Our findings suggest that targeted tracing and quarantine strategies would be most efficient when combined with other control measures such as physical distancing.

"Prosociality is endemic. In a common experiment called the social dilemma, anonymous subjects choose between a "defection" strategy that maximizes their own personal payoffs, and a "cooperation" strategy that gains them slightly less, but gives other members of the group substantially more. Up to 97% of subjects choose cooperation in some social dilemmas. Not surprisingly, researchers have found that the incidence of such prosocial behaviors declines as the personal cost of acting prosocially rises. We are more likely to be nice when it only takes a little, not a lot, of skin off our noses. But the scientific evidence demonstrates the vast majority of people will make at least small sacrifices to follow their conscience and help others."

Scientists say that widespread testing is needed to get outbreaks of the new coronavirus under control. But in many regions, there's a shortage of the chemicals needed to run tests. In several countries, health officials have started using a strategy that was first proposed in the Second World War: group testing. By testing samples from many people at once, this method can save time, chemical reagents and money, say researchers.