Mostly used attributively in medical/scientific writing:
致病菌 (zhìbìngjūn, 'pathogenic bacteria'),
致病基因 (zhìbìng jīyīn, 'disease-causing gene'),
致病因素 (zhìbìng yīnsù, 'pathogenic factor'). The
致 (zhì, 'to cause/lead to') is the same character used in
致命 (zhìmìng, 'fatal') and
导致 (dǎozhì, 'to lead to').