Đánh giá khả năng diệt vi khuẩn Vibrio parahaemolyticus của các chế phẩm thiên nhiên và hiệu quả của các chế phẩm trong phòng bệnh trên tôm chân trắng (Litopenaeus vannamei) = Evaluation of the antimicrobial capability of bioproducts against Vibrio parahaemolyticus and their effectiveness in disease prevention for white leg shrimp (Litopenaeus vannamei)