sb wrote:
Oral vaccine is cheaper than injectable, is easier to administer in mass settings, and provides very good immunity. So it is still used in rural immunization drives in many countries. However - as stated, it may mutate into a wild strain and actually cause illness. Also, being a live virus vaccine, it should not be given to anyone who is immunocompromised or who lives with an immunocompromised person.
Polio is a virus that has no non-human vectors - it does not live in other animals. So the goal was to vaccinate everyone on the planet and therefore eradicate the disease entirely - like we did with smallpox. Wars, mass migrations, other civil disturbances, and vaccine skepticism have disrupted vaccination campaigns and allowed the disease to continue. In some countries rumors abound that vaccination workers are spies for the CIA or are plotting to kill Muslim children. This tends to discourage participation! Sadly there is factual basis for this fear - the CIA organized a vaccination program to collect DNA to pinpoint the location of Osama bin Laden. As good as those results turned out to be, vaccination program directors everywhere were horrified when this information became public.
Oral vaccine is cheaper than injectable, is easier... (
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Right. In most discussions about contagious diseases, they mention the difficulty of immunizing people in the many war zones around the planet. Someone has to get rid of us and try a better species. Humans are worthless.