Answer:
The handler of the snakes has been bitten by the snake and another then he was treated with antivenin. The effect of the venom decreases and the person is well.
The handlers of the snakes if gets bitten by the same snake again then there would have been no effect on the body of the handler because the immune system of the body starts producing antibodies against the antigen.
The antigens of the snake bite would have been neutralized by the antibodies produced by the immune system of body.