Acknowledgement
We are very grateful to the people of China and the world for their tremendous efforts in fighting against COVID-19. We are very grateful to the health workers and people involved working day and night without fear of death. Without the concerted efforts of all the people, COVID-19 in China could not be possibly constrained in 2 months. Special thanks also go to all levels of Chinese health commissions and WHO for making the data public.
Conflict of interests
PFS has received research grants from the National Natural Science Foundation of China (81670744, 81870564) and Science Technology Department of Zhejiang Province of China (No. 2017C33037).
ETHICAL APPROVAL
This study did not involve animal experiments besides the fae‐
cal sampling of diarrhoea dairy calves that visited farm for clinical
treatment.