. Annals of tropical medicine and parasitology. Parasites. ii6 The following approximate percentages of cases will be found to be incorrectly diagnosed, , certain healthy counts will be adjudged malarious and certain malarial bloods will be accounted healthy : Standard of 13 14 IS 16 Tables 4 and 10 {a, b) :— Health (23 cases) ; diagnosed as malaria Malaria (83 cases) ; diagnosed as healthy Captain Stott's counts :— Health (25 cases); diagnosed as malaria Malaria (163 cases); diagnosed as healthy per cent. 26 17 16 22 per cent. 26 27 16 26 per cent. 26 35 12 30 per cent. 26 44 8 39 A simpl
. Annals of tropical medicine and parasitology. Parasites. ii6 The following approximate percentages of cases will be found to be incorrectly diagnosed, , certain healthy counts will be adjudged malarious and certain malarial bloods will be accounted healthy : Standard of 13 14 IS 16 Tables 4 and 10 {a, b) :— Health (23 cases) ; diagnosed as malaria Malaria (83 cases) ; diagnosed as healthy Captain Stott's counts :— Health (25 cases); diagnosed as malaria Malaria (163 cases); diagnosed as healthy per cent. 26 17 16 22 per cent. 26 27 16 26 per cent. 26 35 12 30 per cent. 26 44 8 39 A simple way of writing these errors is to assume that 50 healthy bloods and 50 malarial bloods are examined. When the lOO counts are then studied with these standards, the percentage errors will be :. 15 16 My Tables Captain Stott's Tables per cent, per cent. 30-5 35-0 23-5 Now let us examine the percentage errors obtained when the large mononuclears are disentangled from the large lymphocytes, again using different standards. Standard of 8 9 ; 10 II 12 13 Tables 4 and 10 (a, b):— Health (23 cases); diagnosed as malaria Malaria (83 cases); diagnosed as healthy Or with 50 healthy bloods and 50 malarial bloods, error will be pel cent. lyo 1-2 9-1 per cent. 8-5 1-2 4-8 1 pe r cent. 3-6 1-8 per cent. 10-8 5-4 per cent. 19-0 9-6 per cent. 36-0 i8-o Comparing the most favourable standards above, we find the error is very much reduced by adopting this fuller nomenclature. It is also obvious that the best results are obtained by using a standard of 10 per cent, large mononuclears as indicative of malarial infection—in fact, I did so adopt it for precisely these Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Liverpool School of Tropical Medicine. Liverpool University Press [etc. ]
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