COVID-19 (English Wikipedia)

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高昱 (26 February 2020). "独家 | 新冠病毒基因测序溯源: 警报是何时拉响的" [Exclusive | Tracing the New Coronavirus gene sequencing: when did the alarm sound]. Caixin (in Chinese). Archived from the original on 27 February 2020. Retrieved 1 March 2020.

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"Symptoms of Coronavirus". U.S. Centers for Disease Control and Prevention (CDC). 13 May 2020. Archived from the original on 17 June 2020. Retrieved 18 June 2020.
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"Interim Clinical Guidance for Management of Patients with Confirmed Coronavirus Disease (COVID-19)". U.S. Centers for Disease Control and Prevention (CDC). 6 April 2020. Archived from the original on 2 March 2020. Retrieved 19 April 2020.
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CDC (29 March 2022). "Omicron Variant: What You Need to Know". Centers for Disease Control and Prevention. Retrieved 15 June 2022.
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"Science Brief: Community Use of Masks to Control the Spread of SARS-CoV-2". CDC. 11 February 2020. Experimental and epidemiologic data support community masking to reduce the spread of SARS-CoV-2, including alpha and delta variants, among adults and children. [...] Mask use has been found to be safe and is not associated with clinically significant impacts on respiration or gas exchange under most circumstances, except for intense exercise. The limited available data indicate no clear evidence that masking impairs emotional or language development in children. [I]n combination with other contextual cues, masks are unlikely to produce serious impairments of children's social interactions. A study of 2-year-old children concluded that they were able to recognize familiar words presented without a mask and when hearing words through opaque masks. Among children with autism spectrum disorders (ASD), interventions including positive reinforcement and coaching caregivers to teach mask-wearing have improved participants' ability to wear a face mask. These findings suggest that even children who may have difficulty wearing a mask can do so effectively through targeted interventions.
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"COVID-19 and Your Health". U.S. Centers for Disease Control and Prevention (CDC). 11 February 2020. Retrieved 23 March 2021. To prevent the spread of germs, including COVID-19, CDC recommends washing hands with soap and water whenever possible because it reduces the amount of many types of germs and chemicals on hands. But if soap and water are not readily available, using a hand sanitizer with at least 60% alcohol can help you avoid getting sick and spreading germs to others.
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