New coronavirus mutant strains are caused by various reasons such as high temperature, chemical stimulation and other changes in the genetic material of the previous generation of the new coronavirus. When a new coronavirus is exposed to high temperatures and drugs for a long time, or when a gene mutation or gene recombination occurs during its continuous replication, the nucleic acid arrangement of the original virus can be altered, resulting in a new coronavirus that is not identical to the original one, which is known as a new coronavirus mutant strain, such as the Delta mutant strain and the Omicron mutant strain. In addition, any change in the nucleic acid of the virus can cause mutation. Since the new coronavirus is an RNA virus and does not have a self-correcting mechanism to remove mutated sequences, it is more prone to mutation during replication, which makes it more likely to produce mutant strains. Currently, the mutated strains of the new coronavirus, such as the Omicron variant, are more transmissible and contagious, so you need to pay attention to wearing a mask when you go out in your daily life and wash your hands frequently, so as to pay attention to personal protection.