Hello, Amy.
    I don't know if there are any studies about what  you ask, but I'd be 
surprised if anyone has studied it yet.  However, I'm  wondering why it's 
important?  Breastmilk does contain antibodies, even if  not specific to something 
the baby has caught--formula has NO antibodies.   And, even if there is no 
saliva transfer at breast, mom will still be exposed to  what the baby has, through 
close contact:  kissing, wiping baby's nose,  baby drooling or sneezing, etc. 
 So if mom is exposed in any of these ways,  her milk would soon have the 
antibodies anyway, even without saliva transfer at  breast.
    Dee  

Dee Kassing,  BS, MLS, IBCLC, RLC 
Collinsville IL, in central  USA


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