How can a harmless virus be turned into a vaccine by using genetic engineering?
Nice word for word copying without mentioning a source (which incidentally is http://www.biosafety-info.net/file_dir/2… ) in the first answer. Anyhow, the first thing you have to understand is how a vaccine works. Below is part of an answer I wrote about how vaccines work: When you first are infected, your immune system takes several days producing cells that are uniquely specific to that pathogen and subsequently destroy the infection (hopefully!). After the infection, a fair amount of these cells (and their products) stick around in the body and are called memory cells. If the same pathogen enters the body again, the immune system does have to worry about taking so much time to produce new cells since you already have a large number lying around from the first infection However, the cells that stay in the body after infection have a limited life span in most cases. If a long enough period o
