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On January 3, CDC Director Robert Redfield was notified by a counterpart in China that a "mysterious respiratory illness was spreading in Wuhan [China]"; he notified HHS Secretary Alex Azar, who shared the report with the National Security Council (NSC).According to The Washington Post, warnings about the virus were included in the President's Daily Brief in early January, an indicator of the emphasis placed on the virus by the intelligence community.
On January 3, Redfield emailed and spoke to George Gao, director of the Chinese CDC, and the following day, January 4, emailed an offer of technical assistance.
On January 5, the World Health Organization (WHO) reported a "pneumonia of unknown cause" in Wuhan. The WHO advised against travel or trade restrictions at the time.
On January 6, the CDC issued a travel notice for the city of Wuhan in Hubei province, China, and CDC Director Redfield offered in a letter to Chinese officials to send a team of CDC scientists to assist China. China did not accept the offer for several weeks, which delayed the U.S. access to the virus, important for developing diagnostic tests and a vaccine. China did release genetic data on the new coronavirus on January 9.
During the week of January 6, officials of the Department of Health and Human Services (HHS) convened an intra-agency task force including Redfield (CDC), Azar (HHS), and Anthony S. Fauci, Director of the National Institute of Allergy and Infectious Diseases.
On January 7, the CDC established a coronavirus incident management system to better share and respond to information about the virus.
On January 8, the CDC issued its first public alert about the coronavirus.
On January 9, the WHO issued a statement naming the disease as a new coronavirus in Wuhan.
On January 10, the WHO issued a comprehensive package of guidance to countries on how to test for potential cases. By this date, the WHO warned of the risk of human-to-human transmission.
On January 11, the CDC updated the January 6 Level 1 travel health notice for Wuhan, China.
On January 14, the WHO held a press briefing stating that their information suggested a possibility of limited, but not sustained, human-to-human transmission. The WHO recommended countries to take precautions due to the human-to-human transmission during earlier SARS and MERS outbreaks. The WHO also tweeted that "preliminary investigations conducted by the Chinese authorities have found no clear evidence of human-to-human transmission of the novel #coronavirus (2019-nCoV)". The head of China's National Health Commission, Ma Xiaowei, confidentially provided a "grim" situation assessment to key Chinese health officials. The related memo said "human-to-human transmission is possible." An investigation by AP News indicated that the reporting of a case in Thailand prompted the meeting, as well as the risk of spread with heightened travel during the Chinese New Year and various political considerations. However, the Chinese public is not warned until January 20.
Beginning January 17, the CDC dispatched public health experts to screen incoming airport passengers at John F. Kennedy International Airport in New York City, San Francisco, and Los Angeles, adding monitors at Chicago and Atlanta in late January.
On January 18, HHS Secretary Azar discussed the coronavirus outbreak with President Donald Trump, who, Azar said, criticized him as alarmist.