I would assume that it has something to do with any of the vaccines that include a component that can become active and cause disease. It can be excreted in urine, so a baby with a disposable nappy would be just throwing it out, whereas an mcn might need washing in a certain way to ensure all the disease is killed.
Although, that's just based on my vaccine and science knowledge. I don't use mcn's or vaccinate, so don't take my word for it![]()


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