COVID patients might experience more severe symp on reinfect

千渔千寻
楼主 (北美华人网)
https://www.nationalheraldindia.com/health/covid-19-patients-might-experience-more-severe-symptoms-on-reinfection-study
COVID-19 patients might experience more severe symptoms on reinfection: Study  
COVID-19 patients infected with the virus for a second time might experience more severe symptoms, according to a study which is the first to confirm a case of reinfection with the virus in the US
According to the scientists, including those from the University of Nevada in the US, the patient, a 25-year old male, was infected with two distinct SARS-CoV-2 variants within a 48-day time frame, while testing negative in between infections.
The study noted that the patient's second infection was more severe, resulting in hospitalisation with oxygen support, indicating previous exposure to COVID-19 may not translate to guaranteed total immunity.
The patient tested negative for the virus after testing positive for SARS-CoV-2 in April 2020, the researchers said.
Then in June 2020, after experiencing severe COVID-19 symptoms, including fever, headache, dizziness, cough, nausea, and diarrhea, the patient was hospitalised and tested positive for a second time.

b
bye2020
这个一年前的个例能说明什么呢?有什么统计意义呢?我完全可以怀疑他两次感染的严重程度不同是因为接触病毒的量不同引起的。