I'm reading this info for about the 3rd time as there is so much info here. One comment about 1957 Sally mentions is when
The year 1957 marked the installation of radar worldwide. The “Asian” influenza pandemic began in February 1957 and lasted for a year. A decade later the U.S. launched twenty-eight satellites into the Van Allen belts as part of the Initial Defense Communication Satellite Program (IDCSP), ushering in the “Hong Kong” flu pandemic, which began in July 1968.
This is the year I was hit with the Asian flu, no one else in my family of 5, only me. And I was so so sick but I recovered obviously.
Is Coronavirus Contagious? - Nourishing Traditions