proper noun
COVID-19 is masculine or feminine depending on context in French.
alternative letter-case form of Covid-19
“La COVID-19, apparue en Chine en décembre 2019, est due à un nouveau coronavirus, le coronavirus 2019, à l’origine de la pandémie actuelle.” — COVID-19, which appeared in China in December 2019, is a novel coronavirus, the 2019 coronavirus, which is the origin of the current pandemic.