Maybe there is a slight semantic misunderstanding here, but in fact a "re-infection" is defined as such: A patient must present a infection and the particular

Maybe there is a slight semantic misunderstanding here, but in fact a "re-infection" is defined as such: A patient must present a infection and the particular virus must be sequenced, and then present with an infection later on where the virus is again sequenced and identified as sufficiently different from the first sample. Otherwise it cannot be deemed a re-infection. If these small differences in the genomic sequence are already a different strand, I don't know, not an expert. But all 5 (?) cases known so far had a different sequence identified the second time.