(Bloomberg) — Hong Kong’s new coronavirus outbreak has surpassed the magnitude of its previous waves of infection, in a cautionary tale that the worst may be yet to come in the global pandemic.

Authorities reported 50 local virus cases on Friday, bringing total infections to over 350. The former British colony is now one of the first places in the region to see a new wave dwarf previous outbreaks.

The resurgence in the Asian financial hub has moved at an aggressive pace and erupted less than two weeks ago, after a long stretch during which residents returned to work and normal life. About a third of infections in the new outbreak are of unknown origins, signaling that hidden chains of transmission are widespread.