Listeriosis in fattening pigs caused by poor quality silage - a case report

BMC Veterinary Research

Table 1 Summary of the main findings

		Pig 1	Pig 2	Silage
Pathoanatomical and pathohistological findings	thorax	low grade dystelectasis, low grade peribronchial interstitial inflammatory round cell infiltration	high-grade pulmonary oedema, low grade peribronchial interstitial inflammatory round cell infiltration	n.a.
	abdomen	severe diffuse fibrinonecrotic typhlocolitis, remaining abdominal organs (including inguinal lymphnodes) without pathological findings	severe diffuse fibrinonecrotic typhlocolitis; moderate diffuse fibrinous serositis in the area of the intestine	n.a.
	IHC L. monocytogenes	positive in: lymphatic tissue, lamina muscularis mucosae and lamina propria mucosae of the large intestine; spleen, inguinal lymph nodes		n.a.
Triplex-PCR		positive (B. hyodysenteriae)	negative	n.a.
Microbiological examination of serosa		L. monocytogenes (Pig 1 + 2; Silage)
PFGE analysis of L. monocytogenes		PCR-serogroup 1/2a, 3a (Pig 1 + 2; Silage)
MLST of L. monocytogenes isolates		ST21 (Pig 1 + 2; Silage)
AST of L. monocytogenes isolates	AMP (0.12 to 16 μg/ml)^a	sensitive (≤0.12)^b	sensitive (≤0.12)^b	sensitive (≤0.12)^b
	PEN (0.06 to 8 μg/ml)^a	sensitive (0.25)^b	sensitive (0.12)^b	sensitive (0.1)^b
	SXT (0.5/9.5 to 4/76 μg/ml)^a	sensitive(≤0.5/≤9.5)^b	sensitive(≤0.5/≤9.5)^b	sensitive(≤0.5/≤9.5)^b

^aValues in brackets indicate the test range of according antimicrobial substance
^bValues in brackets represent tested concentration of antimicrobial substance. AST = antimicrobial susceptibility testing, n.a. = not applicable

ISSN: 1746-6148