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At this point the object stops accelerating and continues falling at a constant speed called the terminal velocity (also called settling velocity). An object moving downward faster than the terminal velocity (for example because it was thrown downwards, it fell from a thinner part of the atmosphere, or it changed shape) will slow down until it ...
A vaccine adverse event (VAE), sometimes referred to as a vaccine injury, is an adverse event believed to have been caused by vaccination. [1] The World Health Organization (WHO) refers to Adverse Events Following Immunization ( AEFI ).
The pandemic shook the world's economy, with especially severe economic damage in the United States, Europe and Latin America. [ 434 ] [ 435 ] A consensus report by American intelligence agencies in April 2021 concluded, "Efforts to contain and manage the virus have reinforced nationalist trends globally, as some states turned inward to protect ...
If a vaccination program causes the proportion of immune individuals in a population to exceed the critical threshold for a significant length of time, transmission of the infectious disease in that population will stop. If elimination occurs everywhere at the same time, then this can lead to eradication. [citation needed] Elimination
A September 2020 survey found that half of American adults surveyed said they would not accept a vaccination if it was available at that time, and three-quarters expressed concerns about the pace of the process and fears that a vaccine might be confirmed before its safety and effectiveness are fully understood.
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Failure to maintain cold chain temperature stability results in damage that can reduce or even eliminate vaccine efficacy. [169] [170] Sinopharm and Sinovac's vaccines are examples of inactivated vaccines which can be transported using existing cold chain systems at 2–8 °C (36–46 °F). [171] [172]
The timeline of the COVID-19 pandemic lists the articles containing the chronology and epidemiology of SARS-CoV-2, [1] the virus that causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [2]