The large number of host bat and bird species and their global distribution have enabled significant evolution and spread of coronaviruses. Many human coronaviruses originated in bats.
Idadi kubwa ya bata yenye virusi na spishi za ndege, na aina yao duniani, imewezesha mageuzi na usambazaji mkubwa wa virusi vya korona. Virusi vingi vya korona vya wanadamu vimetoka kwa popo.