Bachmann Never Responds To Challenge To Prove Her Claim About HPV Vaccine | The deadline for the $10,000 HPV vaccine challenge that bioethicist Arthur Caplan issued for presidential candidate Rep. Michele Bachmann (R-MN) expired today. After last week’s GOP debate, Bachmann said a woman came up to her and told her about how the vaccine led to brain damage in her daughter. Another bioethicist Steven Miles first challenged Bachmann to produce a person who had suffered from mental retardation after receiving the HPV vaccine Gardasil. Caplan upped the amount from Miles’ $1,000 to $10,000, to be given to a charity of Bachmann’s choice, if she could prove it. Bachmann never responded to Caplan’s challenge.