Serious, long term health problems are a pretty normal part of the human condition. Serious long term damage is not actually an automatic call for action upending everyone's lifestyle. There needs to be a more precise explanation of what the problem is for it to be meaningful. Background risk for disease is already very high; as you point out normal flu is already threatening and most people basically ignore it.
[0] https://en.wikipedia.org/wiki/Epidemiology_of_herpes_simplex