The Delta strain, which is a variant of the New Coronavirus, may also be referred to as Delta virus, and the vaccine may provide some protection against Delta virus. Clinical data show that the rate of delta virus infection, severity of illness, and mortality are significantly lower in patients vaccinated with the New Corona vaccine than in unvaccinated patients. Therefore, it is recommended that patients who are not fully vaccinated against New Crown should receive the New Crown vaccine regularly and quantitatively according to vaccination guidelines. Delta virus has a high replication rate and is highly infectious in the early stages of infection, and can infect 5-9 individuals at the same time. Because the viral load in the patient’s body is significantly higher, the incubation period of the disease is significantly shorter, the symptoms of the disease are more severe, and the time for nucleic acid conversion after clinical treatment is significantly longer. However, clinical reports have shown that patients who have been fully vaccinated with Neocon have a much lower severity of disease, duration of symptoms, and time to negative nucleic acid regression than unvaccinated patients, so the Neocon vaccine remains one of the most effective ways to prevent and combat delta virus infection. Clinical vaccines do not guarantee a 100% protective effect, and viral infections can occur even in patients who have been vaccinated with Neocon. Therefore, it is still important to protect yourself in daily life, insist on wearing a mask, maintain a safe social distance from others, pay attention to personal hygiene, ensure good indoor ventilation, travel safely and consciously, and seek early medical attention if you develop respiratory symptoms such as fever, dry cough and sore throat.