大面积烧伤的病人，若护理不当，易发生感染而产生严重后果，其主要原因是（ ）
A．特异性免疫能力减弱
B．非特异性免疫能力减弱
C．营养物质不能及时补充
D．体液大量损失
第一道防线是由皮肤和黏膜构成的，他们不仅能够阻挡病原体侵入人体，而且它们的分泌物（如乳酸、脂肪酸、胃酸和酶等）还有杀菌的作用，这种免疫能力是人一出生就有的，人人都有，能对多种病原体有免疫作用．为非特异性免疫，大面积烧伤致使皮肤受损，病人若护理不当，是人体的非特异性免疫能力减弱，所以容易发生感染而引起严重后果．
故选B．
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