When would the first wave have happened? If it were in the last year we'd see immune response to the virus in the antibody tests now rolling out. And if happened before the current wave we'd expect to see a substantial degree of herd immunity and not be having the current epidemic spread so fast.
...I just saw a comment somewhere on here, possibly in another post, of someone wondering why took so long to spread given asymptomatic + pre-symptom spreading.
