From the linked Washington Post article:

China’s state-run Xinhua News Agency announced Thursday that national health authorities issued revised guidelines to consider “clinically diagnosed” coronavirus cases in the confirmed total. Chinese officials previously only counted cases confirmed by nucleic acid tests, which critics said were faulty and greatly underestimated the true magnitude of the epidemic.

and

World Health Organization expert Michael Ryan said in a news briefing that — in a good sign — the novel coronavirus’s behavior doesn’t seem to be as aggressive or accelerating outside of Hubei province.