This document summarizes genetic epidemiology studies of SARS-CoV-2. It introduces genetic epidemiology and phylogenetic analysis as key tools to study the virus's transmission and evolution. Multiple studies examined SARS-CoV-2's genetic diversity and evolutionary relationships to better control its spread and inform public health responses. Phylogenetic analysis provided insights into local transmission clusters and how the virus has evolved over time, aiding efforts to understand and respond to the pandemic.