Ultrastructural studies of some organs from pigs with swine fever.

Six pigs were experimentally infected with swine fever (SF) virus and their organs (tonsils, spleen, pancreas, kidneys and popliteal lymph nodes) were examined by electron microscopy. The study was designed to detect the presence of SF virus in the tissues examined. Particles that were probably SF virus were demonstrated. Paracrystalline aggregates and microtubular structures were also found.