Study says it is safe , although chances of infection or a blood clot exist . Gardasil , which is given in three doses , is recommended for all girls ages 11 and 12 and even for those as young as 9 , with Critics say Gardasil 's maker Merck did n't address safety of vaccine . Vaccine does not protect against all strains of HPV .
Study says it is safe , although chances of infection or a blood clot exist . Critics say Gardasil 's maker Merck did n't address safety of vaccine . Vaccine does not protect against all strains of HPV .