We knew this a long time ago. So did Sci/fi. The Andromida Strain Interesting though. In the old sci-fi novel ,The Andromeda Strain, after so much damage from an Alien virus had been done.They found an old man still living in a small village full of dead people, who had survived. Only Because he was taking so much aspirin for pain.
Now you can read it, I did what Bill told me to do.