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In reply to comment: Northern Africa? (see in situ)

For the same reason vaccines do not “work” and “save” lives in impoverished African and other third world economies. The majority of third world child deaths still occur despite vaccination. These children need proper food, clean water to drink and wash in and sanitation. We give them vaccines instead.

"Its easier to fool people than to convince them that they have been fooled."
Mark Twain