Virulence depends upon

Options :
  1. invasiveness
  2. Invasiveness and toxigenicity
  3. Toxigenicity
  4. infective dose
Answer and Explanation :-

Answer: Option 2

Explanation:

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To separate oneself from the burden, the angst, the anguish that we all encounter everyday. To say I am alive, I am wonderful, I am. I am. That is something to aspire to.
-Garth Stein The Art of Racing in the Rain