1.In the event of aggravation of an occupational disease for which anemployed or self-employed person has received or is receiving benefit under the legislation of a Member State, the following rules shall apply:
(a)if the person concerned has not, while in receipt of benefits, been engaged in an occupation under the legislation of another Member State likely to cause or aggravate the disease inquestion , the competent institution of the first Member State shall be bound to meet the cost of the benefits under the provisions of the legislation which it administers taking into account the aggravation;
(b)if the person concerned, while in receipt of benefits, has pursued such an activity under the legislation of another Member State, the competent institution of the first Member State shall be bound to meet the cost of the benefits under the legislation which it administers without taking the aggravation into account. The competent institution of the second Member State shall grant a supplement to the person concerned, the amount of which shall be equal to the difference between the amount of benefits due after the aggravation and the amount which would have been due prior to the aggravation under the legislation which it administers if the disease inquestionhad occurred under the legislation of that Member State;
(c)if, in the case covered by subparagraph (b), an employed or selfemployed person suffering from sclerogenic pneumoconiosis or from a disease determined under Article 57 (6) is not entitled to benefits under the legislation of the second Member State, the competent institution of the first Member State shall be bound to provide benefits under the legislation which it administers, taking the aggravation into account. The competent institution of the second Member State shall, however, meet the cost of the difference between the amount of cash benefits, including pensions, due from the competent institution of the first Member State, taking the aggravation into account, and the amount of the corresponding benefits which were due prior to the aggravation;
(d)the provisions for reduction, suspension or withdrawal laid down by the legislation of a Member State shall not apply to persons receiving benefits awarded by institutions of two Member States inaccordan ce with subparagraph (b).
2.In the event of aggravation of an occupational disease giving rise to the application of the provisions of Article 57 (5), the following provisions shall apply:
(a)the competent institution which granted the benefits in accordance with the provisions of Article 57 (1) shall be bound to provide benefits under the legislation which it administers taking the aggravation into account;
(b)the cost of cash benefits, including pensions, shall continue to be divided between the institutions which shared the costs of former benefits in accordance with the provisions of Article 57 (5). Where, however, the personhas again pursued anactivity likely to cause or to aggravate the occupational disease in question, either under thelegislation of one of the Member States in which he had already pursued an activity of the same nature or under the legislation ofanother Member State, the competent institution of such State shall meet the cost of the difference between the amount of benefits due, taking account of the aggravation, and the amount of benefits due prior to the aggravation.