50In that regard, it must be recalled, in the first place, that it is clear from the Court’s well-established case-law that the concept of ‘worker’ in EU law extends to a person who serves a traineeship or periods of apprenticeship in an occupation that may be regarded as practical preparation related to the actual pursuit of the occupation in question, provided that the periods are served under the conditions of genuine and effective activity as an employed person, for and under the direction of an employer. The Court has stated that that conclusion cannot be invalidated by the fact that the productivity of the person concerned is low, that he does not carry out full duties and that, accordingly, he works only a small number of hours per week and thus receives limited remuneration (see, to that effect, inter alia, judgments in Lawrie-Blum, 66/85, EU:C:1986:284, paragraphs 19 to 21; Bernini, C‑3/90, EU:C:1992:89, paragraphs 15 and 16; Kurz, C‑188/00, EU:C:2002:694, paragraphs 33 and 34, and Kranemann, C‑109/04, EU:C:2005:187, paragraph 13).
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