Table 1. Overview of experimental groups.

Each group consisted of 10 commercially brown layers, 45 weeks of age.

Group	Treatment	Daily dose/ kg bodyweight (Day 2–5 after challenge)
1	None (infection control)	None
2	Tetracycline	25 mg1
3	Sertraline	8 mg2
4	Tetracycline +sertraline	25 mg1 + 8 mg2

¹ Corresponding to 50 mg Doxylin vet/ kg bodyweight,

²Corresponding to 16 mg Sertrone /kg bodyweight