The Netherlands has reported the world's first death from COVID-19 reinfection.
An eighty-nine year old Dutch woman survived the first time but died after she caught the virus again about two months later.
She also suffered from a rare bone marrow cancer.
The cancer treatments left her with a compromised immune system, but researchers say she should have still been able to fight off the coronavirus.
Her case raised concerns about how long immunity to the virus lasts.