"The old way of making flu vaccines requires that flu viruses be - TopicsExpress

"The old way of making flu vaccines requires that flu viruses be grown in a medium, generally eggs. This process is time consuming and expensive. Now, recombinant DNA—that is, genetic engineering—is used. Bacteria are engineered to grow flu antigens—in some cases, adjuvants, or combinations of the two. The antigens that are grown in bacteria are similar to bits of the hemagglutinin (HA) of a flu virus. This HA grown by bacteria is processed to become the antigen in a flu virus vaccine."

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