M 56
299. Faeces. Three thousand six hundred and thirty-two stools were searched for parasites and the presence or absence of the typical cytological picture of bacillary dysentery. The figures shown in the table are interesting as compared with those of the previous year. Firstly, the number of positive findings is nearly three times as great. Secondly, the number of multiple infestations is similarly greatly in excess; and, finally, the number of infestations with entamoeba histolytica is similarly increased. The latter parasite can no longer be considered a rarity in Hong Kong.
EXAMINATION OF STOOLS FOR INTESTINAL PARASITES.
Table XXXIV.
European Indian Chinese Total Ascaris 38 16 241 295 Clonorchis 6 237 243 Trichuris 19 5 88 112 Ankylostoma 5 19 87 111 Enterobius 4 1 5 E. histolytica 11 40 51 Fasciolopsis 11 11 Multiple infestation 4 9 231 244 Negative 530 105 1,925 2,560 Grand total 617 154 2,861 3,632(3) Serology.
300. The Kahn reaction. Seventeen thousand one hundred and eleven sera were tested. The results are shown in the table.
EXAMINATION OF BLOOD SERA FOR SYPHILIS.
Table XXXV.
European Indian Chinese Total M. F. M. F. M. F. Strong positive 33 1 61 1 1,685 790 2,571 Positive 14 27 H 661 348 1,051 Weak positive 13 16 428 210 667 Doubtful 7 2 13 405 202 630 Negative 507 48 574 7 6,466 4,590 12,192 Grand total 574 51 691 10 9,645 6,140 17,111301. Agglutination tests. Two thousand one hundred and nine sera were examined for the presence of agglutinins against various organisms. Five hundred and nineteen were positive for one or other of the enteric group.