Virus association with wastewater solids.

The solids produced at an urban wastewater treatment plant, tested semiquantitatively, almost all contained human intestinal viruses. Reoviruses and five or more types of enteroviruses were present. Sludge, digested anaerobically at 30 degrees-32 degrees C, and grit contained measurable levels of viruses. Until reliable means of inactivating the viruses have been developed and implemented, great care should be taken in disposing of these solids.