A doctor at Weill Cornell Medical Center in Manhattan described the unnerving experience of walking daily past an intubated, critically ill colleague in her 30s, wondering who would be next.

Another doctor at a major New York City hospital described it as “a petri dish,” where more than 200 workers had fallen sick…

“I feel like we’re all just being sent to slaughter,” said Thomas Riley, a nurse at Jacobi Medical Center in the Bronx, who has contracted the virus, along with his husband.

Medical workers are still showing up day after day to face overflowing emergency rooms, earning them praise as heroes. Thousands of volunteers have signed up to join their colleagues.

But doctors and nurses said they can look overseas for a dark glimpse of the risk they are facing, especially when protective gear has been in short supply.