Porcilis PRRS case report - Greece

This field trial was carried out on a pig farm with a history of PRRS virus infection and PMWS problems (Alexopoulos, C et al., 2003).

Method

380 piglets were vaccinated at 35 days of age with Porcilis PRRS and 282 were left as unvaccinated controls.

Results

Morbidity (%) and mortality (%) of pigs during each stage of development and for the total period (TP)
Period	Control	Vaccinated
Morbidity
Nursery stage	12.41^a	5.52^a
Growing stage	25.27^a	11.17^b
Finishing stage	3.67^a	1.11^a
Total period	40.42^a	17.63^b
Mortality
Nursery stage	1.77^a	1.05^a
Growing stage	11.55^a	3.99^b
Finishing stage	0.04^a	0.00^a
Total period	13.47^a	5.00^b

Values in a row with different superscripts differ significantly, p<0.05.

Morbidity rate (%) of pigs for the total period

Mortality rate (%) of pigs for the total period

The average daily gain, feed intake and feed conversion rates for pigs in the control and vaccinated groups over the entire time period
Period	Control	Vaccinated
ADG
Nursery stage	0.455^b ± 0.06	0.469^a ± 0.05
Growing stage	0.519^b± 0.09	0.550^a ± 0.08
Finishing stage	0.812^b ± 0.09	0.839^a ± 0.09
Total period	0.610^b ± 0.07	0.635^a ± 0.06
ADFI
Nursery stage	0.664^b ± 0.112	0.672^a± 0.009
Growing stage	1.603^a± 0.008	1.591^a ± 0.010
Finishing stage	2.988^a ± 0.013	2.974^a ± 0.015
Total period	1.866^a ± 0.009	1.859^a ± 0.010
FCR
Nursery stage	1.46^a ± 0.07	1.43^a ± 0.05
Growing stage	3.10^a ± 0.16	2.89^b ± 0.11
Finishing stage	3.68^a ± 0.09	3.54^bc± 0.11
Total period	3.06^a ± 0.08	2.92^b ± 0.09

Values in a row with different superscripts differ significantly, p<0.05.

Average daily gain over the total period for vaccinated and control groups

The results above show that in the vaccinated pigs there was:

Substantial reduction of clinical signs of PMWS
Significant reduction of mortality
Increase of average daily growth by 25 g per pig per day

Conclusion

It is clearly demonstrated on a farm affected by both PRRS and PMWS,that vaccination of piglets at 35 days of age with Porcilis PRRS resulted in a significant reduction of clinical signs of PMWS.