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Toxoplasma gondii tachyzoites were seen in the placenta of a late-term aborted Greenland muskox (Ovibos moschatus wardi) fetus in a captive herd at the San Francisco Zoo. The organism stained with anti-T. gondii polyclonal rabbit serum but not with anti-Neospora caninum serum. The dam had a Toxoplasma titer of > or =1:3,200 at the time of abortion and in each of the previous 3 yr (modified agglutination test). The muskox is a new host record for T. gondii.

« Kikuchi's necrotizing lymphadenitisis a cause of benign lymph node enlargement, little known in France. We report a new typical case in a patient who had a strongly positive toxoplasma titer.

Summary An account is given of eosinophilic leukemia in a 5-year-old boy, who died after 2 months' illness. Post mortem examination disclosed a large tumor in the thymic region, as well as infiltrates of eosinophilic leukocytes, mainly immature, in the thymus, lymph nodes, spleen, lungs, heart and kidneys. After 3 weeks' illness, the number of atypical mononuclear leukocytes in the peripheral blood increased markedly. This was followed by an increase in the number of eosinophilic leukocytes. Concurrently, a pronounced rise took place in the serological titers for antipneumolysin and Toxoplasma. The mechanism of development of the changes is discussed against the background of a suggested immunopathological process, in which the thymus may have played a central role.