How many years does our body have the immunity that the gardasil9 hpv vaccine gives our body?

The Gardasil 9 (2014) builds on the Gardasil 4 that was available in 2007. Until we have decades of experience with this comparatively new vaccine the duration of protection is not known. Studies suggest that it will be a decade or more but may be several. T cell memory can emerge and provide a response after antibody levels have declined.

For a very long time exact timing hard to predict as everyone's immune system is different