The safety of Wuhan's coronavirus test centers has become a hot topic for residents.
The re-emergence of new coronavirus cases in Wuhan, the birthplace of the now deadly pandemic, is sparking fears of a fresh wave of infections in China with authorities directing the testing of all 11 million residents of the city under 10 days.
Wuhan conducted 1.79 million tests from April 1 to May 13, according to Reuters' calculations based on daily reports published by the city's health commission.
All of the new cases were locally transmitted and the number of new asymptomatic cases fell slightly to 11 from 12 a day earlier.
Asymptomatic cases are a problem as the patients are tested COVID-19 positive but develop no symptoms such as fever, cough or sore throat.
The unprecedented scale of testing indicates the official level of concern, some experts say.
If Xinhua's report that 3 million tests have been conducted since April also uses figures from the health commission, that would suggest up to 1.2 million tests were administered on May 14 alone. Others say the sheer size of the operation is bound to lead to errors.
China's National Health Commission (NHC) said that of the eight new confirmed COVID-19 cases reported on Friday, six were imported infections.
But the health authority said late on Friday, without elaborating, that 72,791 tests had been conducted on May 14.
Recent outbreaks in northeastern Heilongjiang province and Jilin city have contributed to fears of secondary outbreaks.
From April 3, no new local infections were reported in the Asian country until the contagion resurfaced in Wuhan over the weekend.
Both US President Donald Trump and US Secretary of State Mike Pompeo have repeatedly said that Beijing declined to provide virus samples taken from patients when the contagion began in China late a year ago, and that Chinese authorities had destroyed early samples.
Zeng also said some COVID-19 vaccines were set to complete their second-phase clinical trials in July.
As of Saturday, the number of coronavirus cases stood at 82,947 in China.
Tensions have escalated between Beijing and Washington as they trade accusations over the origin of the virus, which has killed more than 300,000 people worldwide, and China is under mounting global pressure to allow an inquiry into its handling of the pandemic.