Final answer:
A therapist must make an immediate verbal report upon learning of child abuse and follow up with a written report typically within 48 hours, as required by law.
Step-by-step explanation:
When a therapist is informed of child abuse, they are mandated by law to make an immediate report to the appropriate authorities. After the initial report, the therapist must follow up with a written report. The allowable time frame for this written report varies by jurisdiction, but commonly, a therapist is required to submit this report within 48 hours. This protocol is designed to ensure that the allegation of abuse is addressed in a timely and effective manner, protecting the welfare of the child in question.