Table 1.

Animal number and age (d) of calves sampled for each year

Year	Animal number	Sampling time point
		Initial vaccination, d	Preconditioning, d	Weaning, d
2015	820	42.9	137.9	157.5
2016	794	36.6	124.2	145.3

The upper nasal cavity of calves was sampled at initial vaccination, preconditioning, and weaning in 2015 and 2016.

d, days of age.