# WHO is informed of a pneumonia cluster in Wuhan

Date: 2019

On 31 December 2019, WHO was informed of a cluster of pneumonia cases of unknown cause in Wuhan, China. The event is the earliest WHO timeline milestone used here for the outbreak that became COVID-19. It records detection and notification; it does not establish the later global scale on that date.

## Drivers

- COVID-19 pandemic: https://factrail.ai/drivers/covid-19-pandemic

## Sources

_Sources are listed on the canonical page._

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/covid-wuhan-cluster-reported-2019-12-31