Individual risk factors for Mycoplasma hyopneumoniae infections in suckling pigs at the age of weaning

Table 4 Categorical variables of ‘infection data’ and their levels collected from 1,127 piglets

Variable	Level	All piglets		Mhyo neg.	Mhyo pos.
		(n)	(%)¹	n (%)²	n (%)²
Vaccine against M. hyopneumoniae	Suvaxyn® M. hyo	386	34.3	361 (33.2)	25 (61.0)
	Ingelvac® M. hyo	441	39.2	427 (39.3)	14 (34.1)**
	Porcilis® M hyo	298	26.5	296 (27.3)	2 (4.9)**
Vaccination against PCV2	No	310	27.5	308 (28.4)	2 (4.9)
Vaccination against PCV2	Yes	817	72.5	778 (71.6)	39 (95.1)*
Diseases	No	701	62.2	674 (62.1)	27 (65.9)
	Local diseases	15	1.3	15 (1.4)	0 (0.0)
	Systemic diseases	146	13.0	143 (13.2)	3 (7.3)
	Respiratory diseases	265	23.5	254 (23.4)	11 (26.8)
Routine treatment in the 1^st week of life^†	Amoxicillin	386	34.3	361 (33.2)	25 (61.0)
	Toltrazuril & penicillin	441	39.1	427 (39.3)	14 (34.1)**
	Long-lasting amoxicillin	300	26.6	298 (27.4)	2 (4.9)**
Routine treatment in the 2^nd week of life^†	Long-lasting penicillin	441	66.0	427 (60.7)	14 (93.3)
Routine treatment in the 2^nd week of life^†	Amoxicillin & tulathromycin	277	34.0	276 (39.3)	1 (6.7)**
Routine treatment in the 3^rd week of life^†	Tulathromycin	441	100.0	427 (100)	14 (100)
Any treatment against M. hyopneumoniae	No	408	36.2	382 (35.2)	26 (63.4)
Any treatment against M. hyopneumoniae	Yes	719	63.8	704 (64.8)	15 (36.6)*
Level of antibodies against M. hyopneumoniae	S/P ratio < 0,4	799	70.9	769 (70.8)	30 (73.2)
	S/P ratio ≥ 0,4	328	29.1	317 (29.2)	19 (26.8)

Using PCR results from suckling pigs’ nasal swabs as a binomial outcome variable, the incidence rate ratio (IRR; recognizing the first level of each variable as baseline in a univariable Poisson regression analysis) were calculated. Significant differences are indicated with asterisks.
^† if applied.
¹ column-percent.
² row–percent.
* P-value of IRR <0.05.
** P-value of IRR <0.01.

ISSN: 1751-0147