Occurrence of Salmonella spp.: a comparison between indoor and outdoor housing of broilers and laying hens

Table 2 Flocks of broilers tested positive for Salmonella in indoor and outdoor production in Sweden

Year	No. slaughtered birds		No. slaughtered flocks		No. test-positive flocks		No. birds in test-positive flocks		No. birds in test-positive flocks/no. slaughtered birds (%)		Proportion test-positive flocks (%)
Year	Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor
2007	75,987,684	62,040	Nd^a	Nd^a	10^b	1	186,500	1400	0.25	2.26	Nd^a	Nd^a
2008	76,029,408	79,055	Nd^a	Nd^a	8	0	206,700	0	0.27	0.00	Nd^a	Nd^a
2009	74,836,094	179,050	Nd^a	Nd^a	1	3	35,000	4070	0.05	2.27	Nd^a	Nd^a
2010	79,413,074	185,020	Nd^a	Nd^a	17^c	0	320,555	0	0.40	0.00	Nd^a	Nd^a
2011	79,193,063	170,030	Nd^a	Nd^a	3	1	47,000	400	0.06	0.24	Nd^a	Nd^a
2012	77,903,897	170,045	Nd^a	Nd^a	1	0	31,000	0	0.04	0.00	Nd^a	Nd^a
2013	83,110,440	155,000	3233	43	1	0	61,800	0	0.07	0.00	0.03	0.0
2014	89,504,467	176,500	3232	44	2	0	55,000	0	0.06	0.00	0.06	0.0
2015	93,820,000	280,000	3329	61	13^d	0	405,574	0	0.43	0.00	0.39	0.0
Total	729,798,117	1,456,740	9794	148	56	5	1,349,129	5870	0.18	0.40	0.16	0.0

ISSN: 1751-0147