They knew so little. So little. They knew only that isolation worked. The New York State Training School for Girls had quarantined itself, even requiring people delivering supplies to leave them outside. It had had no cases. The Trudeau Sanatorium in upstate New York had similar rules. It had no cases. Across the continent, a naval facility in San Francisco on an island that enforced rigid quarantine. It had no cases. All that proved was that the miasma theory, which none of them believed in anyway, could not account for the disease.