A Note on a Case of Brucella Abortus Infection in Aden

was reported in the United States of America, the number increasing to 1,545 in 1933: the disease appeared in epidemic form in Greece, in 1927 (Livierato, 1932); it first appeared in Scotland in 1930 (Beattie, Smith and Tulloch, 1935) and many cases have been reported all over the British Isles and in other countries, at intervals during the past few years. There is evidence that the infection, though often latent, is widespread in its distribution and routine Widal examinations of sera from unclassified febrile cases in England show agglutination of Br. abortus to a significant titre in about 4 per cent of cases (Messer, 1934). The infection among bovines would seem in the British Isles to be even more widespread; thus Walker Hall (1933) reported the presence in milk of agglutinins to Br. abortus, in the Bristol district, as follows : (1) Raw churn milk, positive in 26 per cent, (2) pasteurized milk, 31 per cent, (3) graded milk, 44 per cent. The apparent anomaly of the rising percentage of positive findings in this series is probably due to the fact that while raw churn milk-samples