Qualifying medical expenses include the costs of diagnosis, cure, mitigation, treatment, or prevention of disease, and the costs for treatments affecting any part or function of the body.

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The world will increasingly recognise that in the case of pandemics, as with heart disease and cancer, an ounce of prevention is worth a pound of cure.

ECONOMIST: Science

McKeown's thesis produced a strong reaction from those who thought his aim was political to rebalance modern health-care from cure to prevention and that he had missed statistical quirks, like the stagnation of the trend toward less disease at a time when urban populations were booming.

WSJ: Matt Ridley on Infectious Diseases and Standards of Living | Mind & Matter