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  2. U.S. state and local government responses to the COVID-19 ...

    en.wikipedia.org/wiki/U.S._state_and_local...

    Full map including municipalities State, territorial, tribal, and local governments responded to the COVID-19 pandemic in the United States with various declarations of emergency , closure of schools and public meeting places, lockdowns , and other restrictions intended to slow the progression of the virus.

  3. COVID-19 pandemic - Wikipedia

    en.wikipedia.org/wiki/COVID-19_pandemic

    Tedros Adhanom Ghebreyesus explained: CO for corona, VI for virus, D for disease and 19 for when the outbreak was first identified (31 December 2019). [23] WHO additionally uses "the COVID-19 virus" and "the virus responsible for COVID-19" in public communications. [22] WHO named variants of concern and variants of interest using Greek letters.

  4. SARS-CoV-2 - Wikipedia

    en.wikipedia.org/wiki/SARS-CoV-2

    Virus infections start when viral particles bind to host surface cellular receptors. [158] Protein modeling experiments on the spike protein of the virus soon suggested that SARS‑CoV‑2 has sufficient affinity to the receptor angiotensin converting enzyme 2 (ACE2) on human cells to use them as a mechanism of cell entry . [ 159 ]

  5. COVID-19 - Wikipedia

    en.wikipedia.org/wiki/COVID-19

    S1 determines the virus-host range and cellular tropism via the receptor-binding domain. S2 mediates the membrane fusion of the virus to its potential cell host via the H1 and HR2, which are heptad repeat regions. Studies have shown that S1 domain induced IgG and IgA antibody levels at a much higher capacity. It is the focus spike proteins ...

  6. Coronavirus - Wikipedia

    en.wikipedia.org/wiki/Coronavirus

    The virus can spread to different organs throughout the chicken. [131] The virus is transmitted by aerosol and food contaminated by feces. Different vaccines against IBV exist and have helped to limit the spread of the virus and its variants. [127] Infectious bronchitis virus is one of a number of strains of the species Avian coronavirus. [133]

  7. Timeline of the COVID-19 pandemic in February 2020 - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_COVID-19...

    Croatia announced its first case of the virus, with a patient hospitalized in the capital, Zagreb, who had traveled to Italy and stayed in Milan. [280] France saw two additional cases: one was a French man returning from a trip in the Lombardy region of Italy; the other was a young Chinese woman returning to France from a trip to China.

  8. SARS-CoV-1 - Wikipedia

    en.wikipedia.org/wiki/SARS-CoV-1

    Scanning electron micrograph of SARS virions. Severe acute respiratory syndrome (SARS) is the disease caused by SARS-CoV-1. It causes an often severe illness and is marked initially by systemic symptoms of muscle pain, headache, and fever, followed in 2–14 days by the onset of respiratory symptoms, [13] mainly cough, dyspnea, and pneumonia.

  9. SARS-CoV-2 Delta variant - Wikipedia

    en.wikipedia.org/wiki/SARS-CoV-2_Delta_variant

    In the Netherlands, the virus was still able to propagate significantly in the population with over 93.4% of blood donors being tested positive for SARS-CoV-2 antibodies after week 28, 2021. Many people there are not fully vaccinated, so those antibodies would have been developed from exposure to the wild virus or from a vaccine.