Vaccine helps against certain cancers, requires three doses

The HPV shot is a vaccine against cancer, but the only drawback is its inconvenience - you must get three shots, spread months apart. 

Yet, new research out of Sweden indicates that getting fewer injections than recommended still provides some protection, which scientists say is encouraging, but not entirely reliable. 

The vaccine is now recommended for both girls and boys and is effective in preventing growing rates of oral cancers. The study further says every shot of the vaccine helps in some way. 

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