This is the 1988th most frequent French word.
virus
A microorganism or pathogen that can infect living organisms and replicate within host cells.
Here, 'virus' is used in the context of technology, referring to malicious software affecting computers.
Le virus informatique a infecté tous les fichiers sur l'ordinateur.
The computer virus infected all the files on the computer.
In this sentence, 'virus' refers to a biological organism causing illness.
Les chercheurs travaillent sur un vaccin contre le virus qui cause la grippe.
Researchers are working on a vaccine for the virus that causes the flu.
Here, 'virus' is employed metaphorically to describe something harmful or spreading within a community.