nicoleg1
nicoleg1 nicoleg1
  • 20-02-2018
  • Health
contestada

Define 1st, 2nd, 3rd, line of defense.

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HolyAngelGod
HolyAngelGod HolyAngelGod
  • 20-02-2018
First line: mechanical, chemical and microbial
Second line: internal/non-specific, involves the immune system
Third line: internal/specific
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