Houston teen Michael John Riley Jr, 14, succumbed to Naegleria fowleri on Sunday after a week-long battle.
Health experts blame rising summer temperature for Naegleria fowleri's presence in the north.
The 21-year-old died four days after her symptoms appeared following a Naegleria Fowleri infection.
Scientists find Naegleria fowleri, a brain-eating amoeba found in tap water, having killed a five-year-old Louisiana boy.
