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Hi there your forgeting about the cycling your doing, flu and cold are a respiratory illness hence why a lot of pros suffer from this, don't be given yourself such a hard time and be more positive on what your achieving, maybe your not resting enough in between rides and pushing when rest is needed, just the fact that your outside and opening up your lungs for long periods is more than enough for a flu festival, have you tried increasing your Vitamin A intake to help with your immune system, good luck and well done on the 280K.
Protein/recovery drink within 45 minutes (ideally 20 minutes) of finishing?