Seeding of parotid carcinoma along Vim-Silverman needle tract

A case report of seeding of parotid carcinoma along a core biopsy needle tract is presented. Excision of the needle biopsy site at the time of definitive surgery is recommended. Aspiration needle biopsy with a fine needle is reliable, with tumor seeding less likely.

Laboratory investigations on neuroparalytic accidents associated with suckling mouse brain rabies vaccine. III. -- Preservation of vaccine potency after elimination of murine brain myelin by centrifugation

Myelin, which has been found in nine day-old mouse brain, was eliminated from weanling mouse brain suspensions by centrifugation at 17,000 g for 10 min, as demonstrated by electron microscopy and guinea-pig inoculation tests for encephalitogenic activity. This centrifugation procedure did not affect the potency of seven batches of suckling mouse brain vaccine, when centrifuged and non-centrifuged samples of the same batches were compared by a modified NIH potency test (t = 0.17). The present results with weanling mouse brain preparations suggest that centrifugation at 17,000 g be used in the preparation of rabies suckling mouse brain vaccine instead of the 1,900 g currently employed, which does not eliminate myelin. This new procedure would be expected to reduce the number of postvaccinal reactions which are attributable to the small amount of myelin which remains in vaccines prepared with new-born animal brains following the current procedure.

Adenocarcinoma of the glandular stomach following 3-methylcholanthrene, N-nitrosodiethylamine, or N-nitrosodimethylamine feeding in carcinogen-susceptible inbred Syrian

Invasive adenocarcinoma of the glandular stomach was induced in 3 BIO 87.20 inbred Syrian hamsters by the administration of 1 ppm N-nitrosodiethylamine or N-nitrosodimethylamine in the drinking water, and in 2 BIO 15.16 and 5 BIO 72.29 inbred Syrian hamsters by gavage of 3-methylcholanthrene. In contrast, many other similarly treated inbred Syrian hamster lines did not develop carcinoma of the glandular stomach. The glandular stomachs of rats and mice are resistant to polycyclic hydrocarcon carcinogenesis; however, the glandular stomachs of certain inbred Syrian hamsters develop adenocarcinoma after polycyclic hydrocarbon gavage. This work demonstrated the importance of genetic factors.

Report of five children with Hemophilus influenzae pneumonia. Resistance to ampicillin must always be looked for

Five cases of Hemophilus influenzae pneumonia were observed in a 13-month period at Fairfax Hospital, Fairfax, Va. More aggressive diagnostic procedures may be required in order to diagnose this disease with greater frequency. This has become especially important in view of the growing recovery of ampicillin-resistant H. influenzae strains.