President Trump’s illness from a coronavirus infection last month was the most significant health crisis for a sitting president in nearly 40 years. Yet little remains known about how the virus arrived at the White House and how it spread.
The administration did not take basic steps to track the outbreak, limiting contact tracing, keeping cases a secret and cutting out the Centers for Disease Control and Prevention. The origin of the infections, a spokesman said, was “unknowable.”
But one standard public health technique may still shed some light: tracking the cluster’s genetic…
