There are about 47 cases which can be assigned to the cit}^ as against 
15 to the country (including the cases from the as^dums [except the 
^lacon cases] among the former). Investigations have been made, 
however, mostly among city inhabitants. 
PREVALEXCE OF INFECTION. 
At many of the hospitals in Germany a large number of exami- 
nations for parasites are made every year, but so far only 4 cases of 
Ilymenolejjis naiut have been reported from that country. Mertens 
(1892, p. 1136) states that 30<) to 400 patients, mostly adult however, 
are examined yearly at the Cologne Hospital, and that formerly the 
eggs of Ilymenolepis nana had never been found. After the discoveiy 
of the eggs of the parasite in the feces of a child who had entered the 
hospital, 100 other children, at that time in the hospital, were carefully 
examined for evidences of parasitic infection. Although 14 cases of 
helminthiasis were found, II. nana was not present. 
In Italy the parasite is decidedly common. Calandruccio estimates 
that in Sicily 10 per cent of the children are affected. 
Venuti (1895), according to Massari (1898), determined the ratio of 
infection among 214 boys in the orphan asylum at Catania to be over 
10 per cent (23 cases), while among 100 boys from various classes of 
the general population he was unable to lind a single case. 
Out of about 2,000 fecal examinations made at this laboratory dur- 
ing 1902-1903, of adult patients at the Government Hospital for the 
Insane, IT ashington, D. C., the eggs of this parasite were encountered 
. 6 times. 
Stiles (1903a, pp. 41, 42), in about 160 fecal examinations made dur- 
ing a recent trip through the South Atlantic States in connection 
with an investigation of uncinariasis, found the eggs of Ilymenolepis 
nana 4 times, once in the examinations of 15 medical students, and 3 
times among 39 children in 2 orphan asylums. 
GEOGRAPHIC DISTRIBUTION OF Hynienolepis luma. 
Geographicalh" the cases of Ilyrnenoleyyis nana in man are distributed 
as follows: 
Egypt, 3 cases; England, 1 case; Sicily, 48 cases; Italy, exclusive 
of Sicily, 27 cases; Russia, 2 cases and 1 doubtful case; Germany, 4 
cases; Servia, 1 case; Siam, 1 case; Japan, 2 cases; Pennsylvania, 1 
case; District of Columbia, 6 cases; South Carolina, 1 case; Georgia, 
3 cases; Texas, 1 case; Brazil, 2 cases; Argentine, 1 case and 1 doubtful. 
The worm has been reported from rats or mice in the following 
places: 
Austria (Stossich, 1898, p. 104); Denmark (Krabbe, 1865, p. 39); 
Germany (Grassi, 1887h, p. 312; Linstow, 1896a, p. 579; Moniez, 1888); 
France (Dujardin, 1845a, TIoniez, 1888); Italy, including Sicily (Grassi, 
