As the novel coronavirus spread through New York City in late March, doctors at Mount Sinai Hospital noticed something strange happening to patients' blood.

Signs of blood thickening and clotting were being detected in different organs by doctors from different specialties.

As colleagues from various departments pooled their observations, they developed a new treatment protocol. Patients now receive high doses of a blood-thinning drug even before any evidence of clotting appears.

Read more about the therapy here.