Immunization counts depend on how many browsers, and browser profiles you have, as well as the OS.
If I am logged into my Admin account and run Spybot Search & Destroy with the allhives switch, it shows immunizations for all profiles available for all users' Firefox profiles as well as IE 32 and 64 bit, and Opera.
On this limited user account that I am logged into right now, I show 192430 items in immunization, which includes 2 Firefox profiles, 1 Opera, as well as IE and hosts file.
The count will also vary week to week with signature updates.