Study on Effect of Bacillus Thuringiensis Insecticidal Crystal Proteins on Ascaris Suum and Immune Protection with Recombinant Ascaris Suum As37 Protein

苏云金杆菌晶体蛋白对猪蛔虫的作用及猪蛔虫重组As37蛋白的免疫保护研究