In 1918, a strain of influenza known as Spanish flu caused a global pandemic, spreading rapidly and killing indiscriminately.

Acute necrotizing encephalopathy, or A.N.E., can result from influenza or other infections, including Covid-19.

Wikimedia Commons/VICTOR MINDELEFF Estevanico’s Fatal Cultural Misstep at Zuni Hawikuh In 1539, a Moroccan slave named ...