Vaccine injuries are rare, but the argument against them is that they are very rare. The CDC's study called Lazarus in 2010 revealed that fewer than one in 100 vaccine injuries are reported because the current surveillance system is voluntary. The Harvard scientists who conducted the study found that one in 37 people were being injured by vaccines versus the CDC's claim of one in a million. The study proposed a machine counting system using cluster analysis to accurately track vaccine injuries without relying on voluntary reporting.