COVID-19 pandemic in the United States
Timeline in the USA
On December 31, 2019, China reported a cluster of pneumonia cases in its city of Wuhan. On January 7, 2020, the Chinese health authorities confirmed that this cluster was caused by a novel infectious coronavirus. The World Health Organization (WHO) issued technical briefings on January 10 and 11, warning about a strong possibility of human-to-human transmission and urging precautions. On January 14, the WHO said "preliminary investigations conducted by the Chinese authorities have found no clear evidence of human-to-human transmission", although it recommended that countries still take precautions due to the human-to-human transmission during earlier SARS and MERS outbreaks.
On January 6, the Health and Human Services Secretary Alex Azar stated that the U.S. offered to send a team of CDC health experts to China to help contain the outbreak. On January 8, the CDC issued an official health advisory via its Health Alert Network (HAN) and established an Incident Management Structure to coordinate domestic and international public health actions. It issued an update on January 17, noting that person-to-person spread was not confirmed, but was still a possibility. On January 20, it activated its Emergency Operations Center (EOC) to further respond to the outbreak in China. The same day, the WHO and China confirmed that human-to-human transmission had occurred.
The earliest confirmed death from COVID-19 occurred on February 6 in Santa Clara County, California, when a 57-year-old woman died from complications caused by COVID-19 that apparently led to a ruptured heart.
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