Scientists first attempted to develop coronavirus vaccines after China's 2002 [[SARS-CoV-1]] outbreak. Teams of US & foreign scientists vaccinated animals with the four most promising vaccines. At first, the experiment seemed successful as all the animals developed a robust [[antibody]] response to coronavirus. However, when the scientists exposed the vaccinated animals to the wild virus, the results were horrifying. Vaccinated animals suffered hyper-immune responses including inflammation throughout their bodies, especially in their lungs. Researchers had seen this same “enhanced immune response” during [[human]] testing of the failed RSV vaccine tests in the 1960s. Two children died. | Scientists first attempted to develop coronavirus vaccines after China's 2002 [[SARS-CoV-1]] outbreak. Teams of US & foreign scientists vaccinated animals with the four most promising vaccines. At first, the experiment seemed successful as all the animals developed a robust [[antibody]] response to coronavirus. However, when the scientists exposed the vaccinated animals to the wild virus, the results were horrifying. Vaccinated animals suffered hyper-immune responses including inflammation throughout their bodies, especially in their lungs. Researchers had seen this same “enhanced immune response” during [[human]] testing of the failed RSV vaccine tests in the 1960s. Two children died. |