Dear Editor, Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the present global public health problem. The disease is already a pandemic affecting more than 34 million people around the world. The main transmission of this disease is by respiratory contact and there are also other possible atypical modes of transmission.[1] Understanding the risk of transmission due to different activities with interrelationships to epidemiology is an important issue in disease prevention. In a recent report from Thailand, the in-depth molecular typing analysis on the epidemiology of SARS-CoV-2 is done and the results showed that there are many risk exposure histories and also many types of virus. Puenpa et al.[2] proposed a different genotype pattern of SARS-CoV-2 among samples from patients with local transmission and imported disease. Puenpa et al. noted the possible usefulness in molecular epidemiology monitoring of the genotype of SARS-CoV-2 for indicating the risk group to be focused on for COVID-19 outbreak containment. Here, the authors reappraised the available previous data on the molecular epidemiology of SARS-CoV-2 with a special focus to access the association between exposure history and molecular epidemiology of SARS-CoV-2. Based on available data on 36 cases with known exposure history,[2] the details of types of SARS-CoV-2 are presented in Table 1. According to the analysis, there is no association between exposure history and type of SARS-CoV-2 (Chi-square test, P > 0.05). Therefore, it can imply that molecular epidemiology monitoring of the genotype of SARS-CoV-2 might not be useful for specifying any specific risk group during the COVID-19 outbreak. Nevertheless, molecular epidemiology surveillance is still helpful for monitoring possible sense mutations that might cause a significant change in disease presentation.Table 1: Exposure history and type of SARS-CoV-2In addition, it is usually difficult to correctly trace the contact exposure history of a COVID-19 patient. A patient might get the disease from occupational work or other environmental exposure.[3] Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.