HBG1 and viral infectious disease: The thesis of higher morbidity in rabbits, including young rabbits and hares after GI.2–RHDV2/b virus infection, due to HBGA antigens, is supported by studies showing a more intense presence and higher numbers of these antigens in the body of rabbits under 32 days of age, compared to 12-week-old rabbits [123] and the similar occurrence of these antigens in hares compared to rabbits [109,137,139,160,161,162,163].