More diverse SARS-CoV-2 variants identified within infected children than in adults As the severe acute respiratory coronavirus 2 (SARS-CoV-2) infections spread rapidly over the world, causing the ongoing pandemic of coronavirus disease 2019 (COVID-19), transmission patterns have evolved quickly. At first, most infections appeared to have been imported, but by the end of February 2020, community spread was occurring in a sustained manner. A new preprint on the medRxiv* server describes the identification of multiple circulating variants of SARS-CoV-2 during this early pandemic period from Asia and Europe. In addition, there were multiple local introductions of different variants, that resulted in multiple waves of transmission.