65 
Kessler found Dibothriocephalus latus the most common intestinal 
worm at St. Petersburg, and this parasite figures more or less promi- 
nently in all the Russian statistics, being present in as high as 10. and 
16.92 per cental Dorpat and Kostroma; the only statistics found 
for this worm in tropical regions are those of Wellman, who reports 
4 cases (1.29 per cent) among 310 natives examined antemortem in 
Angola, West Africa. 
The relative frequency of Trichuris, Ascaris, and Oxyuris also varies 
considerably, though the last is rarer than the other two in ail hut 
three cases, Dobson, Kessler, and Banik alone finding a higher per- 
centage of infection with Oxyuris than with Tricliuris or Ascaris. 
The figures presented in the table emphasize the fact that Trichuris 
and Ascaris are man’s most common and most widely-distributed 
intestinal worms, and are almost equally prevalent. Eleven authori- 
ties give a higher percentage of infection with Trichuris and 12 find a 
higher rate with Ascaris. 
Table 111. — Statistics of the frequency of intestinal worms in man, reported by different 
authors. 
Authority; locality; date of publica- 
tion or of examination. 
Number 
of sub- 
jects ex- 
Infected. 
Infections. 
Trichuris tri- Oxyuris vermi- 
chiura. cularis. 
amined. 
Num- 
ber. 
Percent. 
Num- 
ber. 
Percent. 
Num- 
ber. 
Percent. 
Stiles & Garrison, United States, 1906. 
3,457 
349 
10.10 
267 
7.72 
45 
1.30 
Ashford, King & Gutierrez, Porto 
Rico, 1904 
4,482 
4,482 
100.00 
326 
7.27 
3 
0.07 
Boycott, Cornwall, England, 1904 
98 . 
38 
38.78 
2 
2.04 
Wellman. West Africa, 1904 
310 . 
Daniels, British Central Africa, 1901. 
251 . 
i 
2.79 
Strong, Philippine Islands, 1901 
2,179 . 
Very common. 
Several cases. 
Calvert, India, 1901 
100 
92 
92.00 
12 
12.00 
9 
9.00 
Fearnside, India, 1900 
878 . 
61 
6.95 
Cima, Italy, 1893 and 1896 
110 
50 
45.45 
41 
37.27 
i 
6.36 
Gubareff, Russia, 1896 
486 
325 
66.87 
212 
43.62 
4 
0.82 
Heisig, Greifswald, 1893 
230 
114 
49.56 
. 104 
45.21 
No ova. Worms 
common. 
Dobson, India. 1893 
1,249 . 
55 
4.40 
192 
15.37 
GrusdefI, Kostroma, Russia. 1S92 
260 
119 
45.77 
6 
2.31 
6 
2.31 
Grechaninoff, St. Petersburg, 1890... 
583 
337 
57.80 
154 
26.41 
64 
10.98 
Baranovski, Moscow, 1889 
1,000 
331 
33.10 
53 
5.30 
80 
8.00 
Kessler, St. Petersburg, 1888 
600 . 
30 
5.00 
43 
7 16 
Sievers, Kiel, Germany, 1SS7.4 
2.629 
521 
19.81 
326 
12 40 
Friedrich, Miinchen 1887 
107 
19 
17.76 
10 
9.34 
3 
2.80 
Banik, Munchen. 1S86 
315 
126 
40.31 
26 
8.25 
95 
30.16 
Szydlowski, Dorpat, 1879 
4.00 
0 00 
Roth, Bale, Germany, 1877-1880 
752 
178 
23.67 
Gribbohm, Kiel, Germany, 1872-1877. 
972 
484 
49.80 
313 
32.20 
226 
23.30 
Heller, Kiel, Germany, 1872-1875 
611 
291 
47.62 
187 
30.60 
142 
23.25 
Cruse, Dornat, 1872 
482 . 
Muller, Erlangen. Germany, 1S62-1873. 
1,755 
195 
11.11 
213 
12.13 
Muller, Dresden, Germany 1852-1862. 
1,939 
50 
2.57 
43 
2.21 
b 
32004 — Xo. 28—06 
