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The HPV vaccine is given as an injection into your arm. prison school live action episode 9 The number of doses you need depends on your age and how well your immune system works: people under 25 usually only need 1 dose people aged 25 to 45 usually need 2 doses (given between 6 months and 2 years apart) people with a weakened immune system need 3 doses (ideally given within a