Patur Aval Assur: So if the study shows that there may be correlation, and more research is needed, it would seem the Chassam Sofer would hold not to do metzitzah b’peh. He wrote that if there’s even a minute danger (which the study shows there is), we should not follow kabbalah on it. Doing metzitzah with a glass tube would seem to be the preferable method from a halachic standpoint!
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