Novel coronavirus pneumonia, allergy, or symptoms after vaccination, is reported in the Fawkes news website on 1 May. The summary of the report is as follows: With the advent of spring and COVID-19's persistence, it may be difficult to distinguish between seasonal allergy, COVID-19 infection and side effects after vaccination. "Allergies and COVID-19 infections are hard to distinguish, especially when the two are present at the same time." Said Fred Davis, an emergency doctor at northwell healthcare's Long Island Jewish Medical Center. However, figuring out some key differences between the three may make it easier to distinguish them. "I always ask patients about itching and fever, which is the biggest difference. Allergies usually don't have a fever, but they make you itchy." Health care expert John White mentioned an important difference between COVID-19 infection and allergy. The Centers for Disease Control and prevention also listed the difference between allergies and symptoms of COVID-19 infection. Although symptoms of both two may include cough, shortness of breath or breathing difficulties, fatigue, headache, sore throat, nasal congestion or runny nose, have a fever, chills, muscle and body pain, sudden loss of taste or smell, nausea, vomiting or diarrhea, and so on, are more common in COVID-19 infected cases. Novel coronavirus pneumonia can cause chills or have a fever and feel very tired. Allergies do not usually cause fatigue, "White said." allergies will not cause diarrhea, but the new crown pneumonia will be. As for the situation after vaccination, "side effects usually include arm pain, fatigue and sometimes headache, which is usually a matter of time. These symptoms usually appear about 4 hours after vaccination and alleviate within 24 to 36 hours". White believes that allergies and symptoms of COVID-19 infection will not be so fast relief. In general, if you are not sure what is wrong with you and you may be infected with COVID-19, you should accept COVID-19 test and follow the guidelines so as to avoid the spread of the disease. (outlook new era)