Good to hear refreshing insight. You are very correct, but blood type probably has less to do with it than the organism itself. I have concluded a while back, that most suffer from "parasitic" yeast which has become systemic. There are proteins manufactured by these organisms which directly affect the central control of these essential secretions, lowering IL1 and inhibiting numourous immune-functions. It does this by a) producing mycotoxins lowering lacto-producing bacterium b)sending neuro-peptides to alter and control Master-Cleanse functions and c)redirecting neuro-transmitters to empede inter-cellular signalling pathways.
The main point here is that [proper] saliva and other mucus secretions are paramount to controlling fungal problems.