The Immune System . By Isabella de Jesus, Sarah Dillon, and Moriah Becker . Nonspecific Defenses Against Infection. First line of defense- skin; physical barrier against pathogens Mucous, saliva, and tears contain lysozyme that breaks down bacterial cell walls Second line of defense-
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By Isabella de Jesus, Sarah Dillon, and Moriah Becker
Injection of weakened or similar but less dangerous pathogen to produce immunity