We locked most of the nation down for almost a month and still overloaded medical infrastructure and had to build field hospitals. We're burying people in par

We locked most of the nation down for almost a month and still overloaded medical infrastructure and had to build field hospitals. We're burying people in parks and storing bodies in mobile freezers. Most elective surgeries are still on hold because the hospitals are filled with Covid patients. A few nations had to ration health care and didn't treat people over 60. What other disease has done this since the Spanish flu?