null Why is there more than one needle for the HPV vaccine?

Why is there more than one needle for the HPV vaccine?

The current HPV vaccine (Gardasil9) is 2 doses (2 needles) which protects against 9 strains of the HPV virus. The previous HPV vaccine (Gardasil) had 3 doses (3 needles) and protected against 4 strains of the virus. All doses of the vaccine are needed for best protection against HPV and the only way to obtain its full benefits and protection.

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