Piglets (IMAGE) University of Veterinary Medicine -- Vienna Caption The fungus Pneumocystis carinii causes progressive pneumonia in pigs and is a possible "door opener" for secondary bacterial infections. Credit Michael Bernkopf/Vetmeduni Vienna Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.