BEIJING (Reuters) – Mainland China had 327 new confirmed cases of coronavirus infections on Thursday, the country’s National Health Commission said on Friday, down from 433 cases a day earlier and the lowest since Jan. 23.

That brings the total number of confirmed cases in mainland China so far to 78,824.

China’s central Hubei province, the epicenter of the outbreak, had 318 new confirmed cases, down from 409 a day earlier and the lowest since Jan. 24.

Excluding Hubei, mainland China reported just nine new cases on Thursday, down from 24 a day earlier.

The provincial capital of Wuhan reported 313 confirmed cases, down from 383 a day earlier and the lowest since Jan. 26.

The death toll in mainland China reached 2,788 as of the end of Thursday, up by 44 from the previous day.

Hubei reported 41 new deaths on Thursday, while in Wuhan, 28 people died.

But there are signs that some recovered patients still may be virus carriers.

Global Times, published by official People’s Daily newspaper of China’s ruling Communist Party, said on Friday two coronavirus patients in Jiangsu province who had been initially discharged were re-hospitalized after testing positive again.

It was unclear why these patients tested positive again and authorities did not clarify if they were counted as new infection cases.

Philip Tierno Jr., Professor of Microbiology and Pathology at NYU School of Medicine, told Reuters on Thursday the coronavirus could remain dormant with minimal symptoms and then reactivate.

Song Tie, vice-director of the local disease control center in southeast China’s Guangdong province, told a press briefing on Wednesday that as many as 14% of discharged patients in the province had tested positive again and been readmitted to hospital for observation.

Chinese health officials on Friday projected optimism at a regular press briefing, crediting new treatments and strict quarantines for the lower daily cases.

However, officials still face questions over the initial response to the outbreak. An investigation by independent Chinese news outlet Caixin, released on Wednesday, said officials in Hubei province suppressed information and ordered early virus samples to be destroyed.

The report was widely shared on social media and has now been blocked.

Hubei health authorities did not respond to a request for comment on Friday, and Reuters was unable to independently verify the report.

Earlier this month, the Hubei Communist Party boss and a director of the provincial health commission were dismissed amid widespread public criticism of the authorities’ handling of the epidemic.

It follows a wider backlash over the death of a doctor who was initially punished by local authorities for raising concerns about the virus, which he later contracted.

(Reporting by Huizhong Wu and Ryan Woo; Additional Reporting by Se Young Lee, David Stanway, Cate Cadell and Gabriel Crossley; Editing by Himani Sarkar, Michael Perry and Giles Elgood)