A senior medical official from China says the coronavirus pandemic could be contained by summer if countries around the world come together to combat it, according to Reuters.

“If all countries could get mobilized, it could be over by June,” Zhong Nanshan, the Chinese government’s senior medical adviser, said during a press conference Thursday.

“My estimate of June is based on scenarios that all countries take positive measures,” he said. “But if some countries do not treat the infectiousness and harmfulness seriously, and intervene strongly, it would last longer.”

Zhong said warmer weather could help slow the spread of the virus, which has infected more than 127,000 people worldwide and left more than 4,700 people dead, according to Johns Hopkins University data.

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Zhong’s comments come as China declared the peak of coronavirus cases has passed, as new cases in Hubei province, the epicenter of the outbreak, dropped to single digits for the first time in months.

In recent weeks, the vast majority of new cases have been outside China, and the World Health Organization (WHO) Wednesday recognized the outbreak as a pandemic, urging countries around the world to act fast to detect and contain the virus.

“My advice is calling for all countries to follow WHO instructions and intervene on a national scale,” Zhong said.

Zhong is an 83-year-old epidemiologist who worked to help stop the SARS outbreak in 2003.

Meanwhile in the U.S. Thursday, Director of the National Institute of Allergy and Infectious Disease (NIAID) Dr. Anthony Fauci told the House Oversight and Reform Committee it is a “failing” that individuals cannot “easily” get tested for coronavirus in the U.S.

Fauci made the remarks under questioning from Rep. Debbie Wasserman Schultz (D-Fla.) about why those who need testing have been unable to get it, including nurses who are taking care of infected patients.

The Trump administration has faced criticism from lawmakers who say the U.S. appears to be far behind in testing for the coronavirus compared to other countries.

Less than 10,000 Americans have been tested, far fewer than in other countries like South Korea, which is testing about 20,000 people per day, according to Axios.