Just read this fascinating study that traces the SARS-CoV-2 outbreak in Bavaria at the end of January. They had one infectious person coming in from China and were able to completely trace all infection paths – including genome sequencing of virus samples from all patients and mapping how the virus mutated.

• Investigation of a COVID-19 outbreak in Germany resulting from a single travel-associated primary case: a case series, Böhmer, Buchholz, Corman et al., The Lancet – Infectious Diseases