PORTALS OF ENTRY OF INFECTIOUS AGENTS. i8i 



The following eggs, embryos, or parasites 

 Parasites are taken into the body with foods or water : 

 OR Eggs of Eggs of beef tape-worm (T^ma saginata); 

 Parasites, eggs and larvae of pork tape-worm {tcBnia 



solium); eggs of Taenia echinococcus (dog 

 tape- worm), water; eggs of round worm (ascaris lumbri- 

 coides), water; eggs of pin- worm (Seat-worm, Oxyuris 

 vermicularis)^ water; larvas of Guinea- worm {Dracun- 

 culus medinensis), water; larvae of trichinae (Trichinia- 

 sis), pork; larvae of Uncinaria (hook-worm disease), 

 water and soil; worm of Strongyloides Intestinalis 

 (endemic diarrhoea of hot countries), water (?); eggs 

 of tricocephalus dispar; eggs of parasite causing Bilhar- 

 ziosis (Egyptian haematuria), (?); larvae of common 

 house-fly. 



The commonest infectious diseases of the 

 Genito- genito-urinary organs are the so-called 

 urinary '' venereal diseases," gonorrhoea and syph- 

 Tract. iiis. Both of these infections, however, 



may be found elsewhere upon the body in 

 persons innocent of wrong-doing. In such cases the 

 name of the disease is qualified by the word insontium 

 written after it. In the female the vulva, vagina, 

 urethra, and cervix of the uterus, are often the seat of 

 gonorrhoea and syphilis, less often, of tuberculosis. 

 Following abortion, or delivery at term, the uterus is 

 frequently infected with the streptococcus of erysipelas, 

 the colon bacillus (from feces), and the common mi- 



