- Study suggests that over 2/3rds of SARS-CoV-2-like zoonotic events would not ignite a pandemic, indicating that spillover of these viruses may be frequent, even if pandemics are rare. Large highly connected urban contact networks with superspreading seem critical to the establishment of SARS-CoV-2. https://science.sciencemag.org/content/early/2021/03/17/science.abf8003 11 comments science