Over four years five previously healthy young adults developed necrobacillosis, a severe septicaemic illness caused by Fusobacterium necrophorum. The infections were characterised by sore throat followed by rigors and the formation of metastatic abscesses and all caused considerable diagnostic confusion.

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SUMMARY A new method for the serological grouping of streptococci by coagglutination with specific antibodies adsorbed to protein A-containing staphylococci has been assessed. A total of 242 strains of streptococci, including ,-haemolytic streptococci of groups A, B, C, F, and G, Streptococcus pneumoniae and Strep. faecalis were studied. All streptococci of groups A, B, C, and G, groupable by standard methods, were correctly grouped by coagglutination, although 7-3 % showed varying degrees of cross-agglutination. Two ,B-haemolytic strains of Strep. faecalis produced coagglutination with group C streptococcal reagent. The method appears to be quick, accurate, reproducible, and simple to perform.