新冠阳性患者用英语可以称作 "COVID-19 positive patient."
"COVID-19" 是新型冠状病毒（SARS-CoV-2）引发的冠状病毒疾病的简称，"positive" 指的是病毒检测呈阳性。
下面是一些例句：
"The COVID-19 positive patient has been isolated and is receiving treatment."
(阳性患者已经隔离并接受治疗。)
"We need to take precautions to prevent the spread of the virus from the COVID-19 positive patient."
(我们需要采取预防措施防止病毒从阳性患者传播。)
"The COVID-19 positive patient is showing symptoms of fatigue and shortness of breath."
(阳性患者出现疲劳和呼吸急促的症状。)