Pharmaceutical companies Sanofi and GSK have announced that they are pushing back the expected availability date of their Covid-19 vaccine until the end of 2021, due to a low immune response in elderly people. Issuing a joint statement following their phase 1 and 2 interim results, they said they would need to conduct a phase 2b study with an improved antigen formulation, after their vaccine candidate showed an insufficient response rate in older adults. Executive Vice President of Sanofi Pasteur Thomas Triomphe explained: “We care greatly about public health, which is why we are disappointed by the delay announced today, but all our
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