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With 137 newly confirmed infections, cases on the Diamond Princess reach 355.
China confirms 5,090 new cases and 121 new deaths, raising the counts to 63,851 and 1,380, respectively.
"The greatest risk is from an unsuspected patient in an unprepared hospital."
Officials will use the nation's flu surveillance system to detect the new coronavirus.
Ideally, experts say, anyone coming into the room with a COVID-19 patient should wear a tight-fitting respirator, not a looser-fitting surgical mask.
Changed diagnostic criteria lead to 13,332 new cases, bringing China's total to near 60,000.
Also, researchers report finding the virus in saliva, but not in a small group of babies born to infected moms.
One of the reagents used in the tests wasn't performing consistently.
Contrary to earlier official reports, more than 500 healthcare workers were infected by mid-January.
A WHO advance team landed in China today for a joint international mission.
Backer JA, Klinkenberg D, Wallinga J. The incubation period of 2019-nCoV infections among travelers from Wuhan, China. medRxiv 2020 Jan 30
Chan JFW, Yuan S, Kok KH, et al. A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster. Lancet 2020 (published online Jan 24)
Huang C, Wang Y, Li X, et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. Lancet 2020 (published online Jan 24)
Li Q, Guan X, Wu P, et al. Early transmission dynamics in Wuhan, China, of novel coronavirus-infected pneumonia. N Engl J Med 2020 (published online Jan 29)
Lu R, Zhao X, Li J, et al. Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding. Lancet 2020 (published online Jan 30)
Zhu N, Zhang D, Wang W, et al. A novel coronavirus from patients with pneumonia in China, 2019. N Engl J Med 2020 (published online Jan 24)
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