NBC News - Researchers have identified one more important reason flu shots don’t usually work very well — it’s because they are grown in chicken eggs. Flu viruses mutate every year and it turns out the methods used to make flu vaccines cause them to mutate even more, the researchers found.
“How you prepare the vaccine can have profound effects on how humans respond to it,” said Scott Hensley of the University of Pennsylvania, who helped lead the study. It’s one more reason the world needs to develop more modern methods of making flu vaccines, says Dr. Anthony Fauci, director of the National Institute for Allergy and Infectious Diseases. “We need to get away from the antiquated production model, which the egg is,” Fauci said...>>>