If by secondary you mean bacterial infection around days 6, then that was one of the hypotheses and the reason for getting antibiotics (I have only taken antibiotics several times in the last 25 years). I also took a mild anti clotting agent (aspirin) as recommended by my doctor. Also I am 45 years old, so even though I am in a good physical shape (non obese, working out on a regular basis, not taking any medication apart from vitamins and herbs) and don't exactly qualify as young :).