Recombination of SARS-CoV is taken as a typical example here; it also shows evidence of positive selection during episodes of interspecies transmission.
Kwa upande mwingine, kijikundi kidogo cha visa kali vya COVID-19 pia kinaweza kuonekana kama ilivyo katika kisa cha maambukizi ya SARS-CoV, ingawa vipimo ni vya chini zaidi.