Recently, at the center of the expansion of the new corona is the delta strain mutant virus, which was first discovered in India. Epidemic prevention officials predict that Delta stocks could become the dominant species in South Korea’s new corona epidemic as early as the following month. The Delta strain is 2.7 times more infectious than the conventional non-mutated virus and 1.6 times more infectious than the British alpha strain. Infection with the Delta strain has few symptoms of dysgeusia, which is a typical feature of infection with non-mutated viruses. Instead, there are more common symptoms such as fever, headache, sore throat, runny nose, and cough. Jeong Eun-Kyung, director of the Central Epidemic Prevention Countermeasures Headquarters, mentioned overseas research related to Delta strains, saying, “(Delta strains) may have high hospitalization rates and severity. Symptoms are similar to non-mutation, but there were a few more symptoms such as headache, sore throat, and nasal discharge. ” However, since it is difficult to distinguish by these symptoms alone, if you have symptoms such as fever, taste / smell disorders, headache, sore throat, and runny nose, suspect the new corona and have it examined immediately. ” In the case of PCR test, it can be confirmed whether or not the infection has occurred within 3 hours at the shortest. However, it is not easy to identify mutant strains. For Delta strains, the analysis takes 4-5 days, up to a week or more. Yu Chung-won, director of the Infectious Disease Diagnosis and Analysis Bureau of the Disease Control Agency, said, “To confirm whether or not the disease is a mutation, we go through the steps of sample collection-analysis-positive confirmation-sample transfer-analysis-mutation confirmation. Mutant strains can be confirmed at five regional centers, but the analysis is short and takes only one day because it takes some time to transfer the samples. ” Alpha, beta, and gamma strains can now be confirmed by PCR alone for mutations.