576. A person who, before the date of the coming into force of Division I of Chapter III, received an indemnity under the Act respecting indemnities for victims of asbestosis and silicosis in mines and quarries (chapter I-7) and who suffers a recurrence, relapse or aggravation after that date remains subject to the said Act, if he receives a supplementary indemnity under the Act at the time of the recurrence, relapse or aggravation. If the person does not receive an indemnity as in the first paragraph at the time, he becomes subject to this Act and sections 556 and 557 apply to him, with the necessary modifications.