The red tide.
D002493:Central Nervous System Diseases / Q000209:etiology; D003116:Color; D004769:Enterovirus Infections / Q000209:etiology; D056890:Eukaryota; D005517:Foodborne Diseases; D006801:Humans; D012623:Seawater; D012758:Shellfish; D006113:United Kingdom; D014481:United States