Katelyn Jetelina, an epidemiologist at the University of Texas, Houston, says that age is the biggest personal risk factor, followed by having certain comorbidities or being immunocompromised.

Katelyn Jetelina 是休斯顿德州大学的流行病学家，她说最大的个人风险因素是年龄，其次是有某些合并症或免疫受损。