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I do believe it was probably pressure from Ins companies. However the guidelines are just that- if your ins covers yearly, you can do yearly, & that is what I strongly recommend.
Many Dr.'s do not agree with the changes either.
I understand that every yr thousands if not millions have good results from their pap smear.
However if you are having sex- this is 2010- no one can truly say their partner is 100% faithful, and many STD's cause serious damage, or cancer if not treated early. I do not recommend every 2,3, 20 yrs. I say every yr period.
Others do not feel they are necessary every year- leaving it up to each individual. I support each individuals decision, but I think the changes will come back to haunt many.