https://www.mercurynews.com/2020/04/01/coronavirus-how-sick-will-you-get/

Monica and Adrian Arima both were infected by the COVID-19 virus at the same time on the same Nile River cruise, probably during a shared dinner buffet between the Egyptian cities of Aswan and Luxor. As they traveled home to Palo Alto, the couple’s early symptoms — body aches and low-grade fever — were identical.

But then, mysteriously, their experiences suddenly diverged. Monica spent 13 days at Stanford Hospital; Adrian was there for just three days. She needed extra oxygen and an experimental drug; he didn’t.