blood worm meaning in English

红虫；颤虫
红筋虫

Police today ( august 31 ) clarified that investigative enquiries made so far did not show that the blood worms found in some of the leisure and cultural services department ( lcsd ) managed public swimming pools had developed in the water of the swimming pools
警方今日（八月三十一日）澄清调查至今并没有证据显示，在康乐及文化事务署（康文署）辖下部分公众泳池内发现的红虫是在泳池水内生长。