md usa spybot fan said:The immunization count varies among the various operating systems. This is because for certain types of immunization Spybot adds the same immunization entries to multiple registry hives, if those registry hives exist in the operating system.
The above information was found by doing a search for "registry hive" at search.microsoft.com:A hive is a group of keys, subkeys, and values in the registry that has a set of supporting files containing backups of its data.