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At the SSPX chapel in San Antonio, a couple years ago, one man received the Precious Blood during Mass on Sunday. He had some kind of allergy or intolerance. The priest would administer to him from a small chalice kept in the tabernacle.
It really was quite a spectacle. It's a shame Trad priests don't have more time, to say more Masses for each area per week, so that individuals like this could have their special needs met at a Mass with less attendance.
That presumes that such catering to special needs is legitimate. I honestly don't know, not having studied this in a professional manner.
I do know that we had a parishioner who was gluten intolerant, but she never got to receive Communion. Not from a gluten free or low-gluten host, and not from the chalice. This was under Bp. Zendejas.
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According to one approach aimed at eliminating the effects of gluten for those who have intolerance issues with gluten, a priest who offers them gluten-free Holy Communion would have to not only use a separate ciborium for the gluten-free host(s), he would also have to wash his hands before touching it. He would have to observe such caution before Mass during preparation, such that placing any gluten-containing hosts in one ciborium then going to the gluten-free host(s) to place them he would have to wash his hands first. Likewise, he would need to use a separate cloth for cleaning the gluten-free ciborium since particles of gluten could be transferred from the cloth if it had been used already on a gluten-containing ciborium. Etc...
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I'm not so sure about the "spectacle" aspect. There are other irregularities that affect everyone much more than an extra trip for the priest to the tabernacle and back. What about the ceremony of abjuration of error for schismatics converting to Roman Catholicism? The candidate comes to the communion rail, generally immediately before Mass with the entire congregation in attendance, and kneels there while the priest stands before him reading aloud the text that the candidate repeats one phrase at a time for everyone to hear. That's no big deal.
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What about the community recitation of the St. Louis Marie Grignion de Montfort's Total Consecration to Mary? The priest kneels before the altar like in the Leonine Prayers after Low Mass (which are likewise no big deal) and leads the congregation in the complete form, which takes about 2 minutes to recite. That's no big deal.
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What about the May Crowning ceremony, where a young girl from the congregation is designated to place the crown of roses on Our Lady's head, while the people sing a hymn, usually "Mary We Crown Thee with Blossoms Today..." That's no big deal.
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So where do you come up with the priest taking an extra 30 seconds to walk to the tabernacle for gluten-free host(s) and back, being a "spectacle?"
He has to do that every time he runs out of hosts anyway, for Masses with large numbers of recipients. Is that "really quite a spectacle" too?