Protection against experimental echinococcosis by non‐specifically stimulated peritoneal cells

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Abstract
Infection of cotton rats with Echinococcus multilocularis or vaccination with BCG or its cell walls activates peritoneal cells to kill the protoscolices of the parasite in vitro and protects laboratory animals against the cestode. To determine whether other nonspecific stimuli would also protect against the parasite, cotton rat peritoneal cells were activated in vivo with PHA [phytohemagglutinin] and transferred to recipients 3 days later. The recipients, controls and PHA-treated animals were then inoculated with the parasite; 3 days after inoculation other untreated infected animals received cells activated in vivo with PHA. PHA-activated cells, the PHA treatment itself and immunization with a homogenate of the parasite stimulated a leucocytosis and protected against infection by E. multilocularis; carrageenan abrogated protection in PHA-treated animals. Protection against echinococcosis can be induced nonspecifically; immunity in hydatid disease may have an important component in the inflammatory reaction.