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A PNAS report in September 2020 confirmed that the virus is much more dangerous for the elderly than the young, noting that about 70% of all U.S. COVID-19 deaths had occurred to those over the age of 70. [94] As of early August 2020, among the 45 countries that had over 50,000 cases, the U.S. had the eighth highest number of deaths per-capita.
A COVID-19 vaccine is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 . Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute ...
Weekly confirmed COVID-19 deaths Map of cumulative COVID-19 death rates by U.S. state [8] On December 31, 2019, China announced the discovery of a cluster of pneumonia cases in Wuhan. The first American case was reported on January 20, [9] and Health and Human Services Secretary Alex Azar declared a public health emergency on January 31. [10]
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic . The symptoms of COVID‑19 can vary but often include fever, [ 7 ] fatigue, cough, breathing difficulties , loss of smell , and loss of taste .
The first cases of the COVID-19 pandemic of Coronavirus Disease 2019 in North America were reported in the United States on 23 January 2020. Cases were reported in all North American countries after Saint Kitts and Nevis confirmed a case on 25 March, and in all North American territories after Bonaire confirmed a case on 16 April. [2]
Widespread non-communicable diseases such as cardiovascular disease and cancer are not included. An epidemic is the rapid spread of disease to a large number of people in a given population within a short period of time; in meningococcal infections , an attack rate in excess of 15 cases per 100,000 people for two consecutive weeks is considered ...
Feline enteric coronavirus is a pathogen of minor clinical significance, but spontaneous mutation of this virus can result in feline infectious peritonitis (FIP), a disease with high mortality. [127] There are two different coronaviruses that infect dogs.
This article documents the chronology and epidemiology of SARS-CoV-2, the virus that causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic, in November 2022. The first human cases of COVID-19 were identified in Wuhan, China, in December 2019.