-Jan 30: The World Health Organization declares a global health emergency. The U.S. reports its first cases of person-to-person transmission of the new virus. A research paper published in the New England Journal of Medicine confirms the asymptomatic transmission of the coronavirus. Commerce Secretary Wilbur Ross says the virus will be good for the U.S. economy in a Fox News interview (see video below). Secretary Azar directly warns President Trump that the virus could morph into a pandemic, a warning the president discounts as alarmist. Warnings also continue to come in from the intelligence community about the dangers of the virus. Trump tells an Iowa crowd at a rally that proponents of the Green New Deal want to, “crush our farms, destroy our wonderful cows. They want to kill our cows.” Brexit begins, with Britain’s final departure from the EU planned for Friday. *
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Where's CNN's complaint about too many Chinese people on the virus control taskforce in China…no diversity there either. Bet there's not much diversity on the virus control taskforce in Nigeria either….or on the one in Mexico…or the one in Korea…or Pakistan…etc, etc….— Mark Dingman (@amdingman) January 30, 2020
LIVE: Press conference on the Emergency Committee meeting on #2019nCoV https://t.co/hTQam7RWc9— World Health Organization (WHO) (@WHO) January 30, 2020
You monster! How dare you!?— Laurie Garrett (@Laurie_Garrett) January 30, 2020
Wilbur Ross in the #Trump administration sees happy news in the #coronavirus outbreak — as long as it stays in China. https://t.co/0UlrcAwKVv
Based on the data on exposures among 10 confirmed #2019nCoV cases, the mean incubation period was 5.2d, the 95th percentile of the distribution was 12.5 days (9.2 to 18), supporting 14d medical observation recommendation for exposed persons. #IDTwitter https://t.co/QSmAxSaw6A pic.twitter.com/m2FuAbyJ77— Muge Cevik (@mugecevik) January 29, 2020
In this new modelling study, using ground, rail and air travel data, Simon Cauchemez @institutpasteur & colleagues *estimate* the probability of 2019 novel coronavirus importations throughout China prior to the Wuhan quarantine. #IDTwitter #2019nCoV https://t.co/5dVJS5xRhd— Muge Cevik (@mugecevik) January 30, 2020
* Timeline summaries at the top of the page come from a variety of sources:, including The American Journal of Managed Care COVID-19 Timeline (https://www.ajmc.com/view/a-timeline-of-covid19-developments-in-2020), the Just Security Group at the NYU School of Law (https://www.justsecurity.org/69650/timeline-of-the-coronavirus-pandemic-and-u-s-response/), the “10 Things,” daily entries from The Week (theweek.com), as well as a variety of newspapers and television programs.