I found a forum where others suspect that their immune system took a temporary hit after the flu shot, resulting in a cold sore outbreak.
After researching further, I also found that there is arginine in flu vaccines. How much? I don't know. Enough to warrant a "do not take if allergic to arginine" warning. It seems to be in only the nasal spray form of the vaccine. I took the shot specifically for pregnant women, so theory #1 sticks better.
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