Translation guide
The English word 'viral' has two main uses: describing something related to viruses (medical/biological) and describing content that spreads rapidly online. This guide covers both meanings with natural Japanese expressions.
Describing something caused by or relating to a virus, such as an infection or disease.
The most common and direct translation for 'viral' in medical contexts. It means 'viral' as in 'caused by a virus'.
A viral infection is going around.
Literally 'caused by a virus'. Used when you want to emphasize the cause.
This illness is viral (caused by a virus).
Simply 'of a virus'. Can be used attributively, but ウイルス性 is more common for 'viral'.
Examine the viral genes.
Describing content such as videos, posts, or memes that become very popular and spread quickly on the internet.
The loanword 'viral' is widely understood in Japanese internet culture. Often used in compounds like バイラル動画 (viral video).
That video went viral.
Means 'spread rapidly'. A natural way to describe something going viral without using the loanword.
That tweet went viral.
Literally 'become a topic'. Implies something is being talked about widely, often used for viral trends.
His post is going viral.
Slang derived from 'buzz', meaning to go viral or create a buzz online. Very casual.
Means 'be spread/disseminated'. Often used in news contexts for information spreading rapidly.
Misinformation went viral on social media.
ウイルス性 (virus-sei) only means 'viral' in the medical sense. Using it for internet memes will cause confusion. Use バイラル or 急速に広まる instead.
That video is viral. (incorrect, sounds like it's about a virus)
バイラル is a neutral loanword, while バズる is slangy and implies a more explosive, buzz-like spread. バズる is often used for short-lived trends, whereas バイラル can be used for any viral content.
The video went viral overnight.
Viral marketing is effective.
He has a viral infection.
This video is going viral, huh.