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SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of SARS-CoV-2 that is considered most plausible by the scientific community.
The transmission of COVID-19 is the passing of coronavirus disease 2019 from person to person. COVID-19 is mainly transmitted when people breathe in air contaminated by droplets/aerosols and small airborne particles containing the virus. Infected people exhale those particles as they breathe, talk, cough, sneeze, or sing.
The human coronavirus NL63 shared a common ancestor with a bat coronavirus (ARCoV.2) between 1190 and 1449 CE. [76] The human coronavirus 229E shared a common ancestor with a bat coronavirus (GhanaGrp1 Bt CoV) between 1686 and 1800 CE. [77] More recently, alpaca coronavirus and human coronavirus 229E diverged sometime before 1960. [78]
Screening for COVID-19 in pregnant women in New York City, and blood donors in the Netherlands, found rates of positive antibody tests that indicated more infections than reported. [55] [56] Seroprevalence-based estimates are conservative as some studies show that persons with mild symptoms do not have detectable antibodies. [57]
During the COVID-19 pandemic, anti-vaccination misinformation about COVID-19 circulated on social media platforms related to the spike protein's role in COVID-19 vaccines. Spike proteins were said to be dangerously "cytotoxic" and mRNA vaccines containing them therefore in themselves dangerous. Spike proteins are not cytotoxic or dangerous.
"The difference in age group has no huge significance when it comes to contracting COVID-19. Children could be less likely to transmit the virus, but our data is not enough to confirm this ...
According to the latest CDC estimates, the KP.3.1.1 variant is causing nearly 60% of new COVID-19 infections, and the XEC strain is rapidly becoming more common, responsible for 10% of new ...
The origin of COVID-19 became a source of friction in China–United States relations. The lab leak theory was promulgated in early 2020 by United States politicians and media, particularly US president Donald Trump , other prominent Republicans, and conservative media (such as Fox News pundit Tucker Carlson, and former Breitbart News publisher ...