The California Department of Health has issued an All Facilities Letter (AFL) providing updated information on the 2019 Novel Coronavirus (2019-nCoV) and guidance for patients under investigation (PUI) from the Centers for Disease Control and Prevention (CDC). The letter highlights the risk of person-to-person transmission and confirms that asymptomatic individuals can transmit the virus. It also states that current laboratory tests are not effective in detecting asymptomatic carriers. Healthcare facilities must report any PUI for 2019-nCoV to the local public health officer and their local CDPH Licensing & Certification District Office. The CDC does not recommend the use of face masks for the general public. The US has implemented temporary measures, including mandatory quarantine for US citizens returning from Hubei province and entry restrictions for foreign nationals who have traveled in China within the last 14 days.

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