The cold & flu were bad examples since they do share some similarities. A better example would be food poisoning and the flu: eating spoiled food doesn't make you less likely to catch a respiratory virus.
I think I agree with what you are saying. Paraphrased/simplified, the problem is that the extreme end of the hygiene hypothesis is to have a non clean area at all.
Reminds me of the somewhat silly phrase of "what doesn't kill you makes you stronger." Unless, of course, it leaves you much much weaker. Which is very possible.
Reminds me of the somewhat silly phrase of "what doesn't kill you makes you stronger." Unless, of course, it leaves you much much weaker. Which is very possible.