34 



Number of examinations. 



The majority of the cases could be examined only once, but 

 a certain number were examined two or more times. Three out 

 of the four adults who were positive for E. histolytica were 

 discovered at the first examination, and one at the third examina- 

 tion. Among the children, both positives were found at the first 

 examination. The following table shows the number of examina- 

 tions made per case for the whole series : 



333 128 



Sex and Protozoal Infection. 



In the following table all the adults examined (333) are 

 divided into males and females, so that a comparison between 

 the incidence of protozoal infections in the two sexes can be 

 made. It will be seen, however, that there is very little 

 difference between them in this respect : 



Adults. 

 Males. Femalea. 



Total No. examined . 172 161 



Age, Occupation, Residence. 



From the above tables age seems to have little or no bearing 

 upon the protozoal infection except possibly in one case, that of 

 infection with lamblia {Giardia intestinalis). Children appear to 

 be infected in greater numbers than adults. This is shown in 

 the first table, where for children the percentage is 39-8, while 

 for adults it is 3-8 only. Two groups of children have been 

 examined, and in each group the lamblia infection is higher 

 among them than among adults taken from the same institution. 

 The higher percentage was found among the Workhouse children, 

 where it reached 48-8 per cent., as against 3-6 per cent, found in 

 adults from that institution. Among the children examined from 

 the Leeds General Infirmary the percentage was 23-9 compared 

 with 3-9 found in the corresponding adults. 



The age at which children were found to be infected in the 

 greatest numbers was between one and four years. 



There does not seem any relation between occupation and 

 infection, neither does the place of residence, whether in a large 



