RJ TextEd 15.96 for apple instal2/16/2024 By December 2020, almost four dozen countries had introduced or proposed contact tracing apps and encouraged people to download and use them. University research groups, governments, and technology companies responded by building mobile applications that leveraged and deployed cell phone data. However, the rapid transmission of COVID-19 and high rates of infection from asymptomatic individuals have made manual contact tracing infeasible, and contact tracing through mobile technologies was promoted as a faster, less labor-intensive, and more efficient means of controlling viral spread. Public health departments have long used contact tracing as a means of tracking, limiting, and decreasing the spread of infectious disease. Many states declared states of emergency and implemented contact tracing by public health staff to let individuals know that they may have been exposed to someone with confirmed or probable COVID-19. While the first case in the USA was detected in an individual in Washington State in January 2020, there soon were community outbreaks across the country, and in early March 2020, the US government declared a public health emergency due to the outbreak. By early January 2020, it was determined that the cause was a newly discovered coronavirus, soon to be known as COVID-19. In December 2019, the World Health Organization (WHO) was informed of several cases of pneumonia of unknown cause in Wuhan City, China.
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