It is striking how often Christ is shown healing, and how often Christianity is associated with actual medical-type healing.
Presumably this is more than a metaphor of re-birth. I think we are probably intended to regard every healing in a spiritual sense - in particular every time we ourselves are healed, then we ought to regard this as a rebirth - a miniature version of salvation.
This is easy to forget or to misattribute by a reductionist physical framework. When delivered from an agonising headache we are more likely to give thanks to aspirin, a physician or a pharmacist than to God.
But that deliverance, that healing, is supposed to be a fresh start. We are born again every time we are healed - if only we can see it that way.