PORTALS OF ENTRY OF INFECTIOUS AGENTS. 173 



The strictly inoculable infectious diseases 

 Skin and are tetanus (lock-jaw), syphilis (acquired), 

 Mucous lupus vulgaris (cutaneous tuberculosis). 

 Membranes, erysipelas, actinomycosis (cutaneous), 

 glanders (farcy), leprosy (?), typhus fever, 

 plague, anthrax (malignant pustule), hydrophobia, 

 mountain fever (?), foot and mouth disease, malarial 

 fever, yellow fever, filariasis (elephantiasis) blastomy- 

 cetes, mycetoma (Madura foot), small-pox, and soft 

 chancer. 



Vegetable parasites are the cause of ring-worms of 

 various parts (tinea tonsurans, tinea circinata), barber's 

 itch (tinea sycosis), tinea versicolor, pinto (spotted sick- 

 ness), yaws, and craw-craw. Thrush is a vegetable 

 parasitic affection of the mucous membrane of the 

 tongue and cheeks of infants. 



Animal parasites which gain entrance through the 

 skin are represented by the embryos of the uncinaria 

 (parasite of hook-worm disease). 



Parasitic insects of the skin are Sarcoptes scabiei 

 (itch-mite) ; the head, body, and pubic louse; the larva of 

 the horse bot-fly (gastrophilus equi), which causes 

 ''Creeping Eruption;" mosquitoes, which inoculate the 

 agents of malaria, yellow fever and filariasis, and prob- 

 ably that of dengue; and the fly glossina which prob- 

 ably inoculates the parasites of trypanosomiasis 

 (sleeping-sickness) . 



The mouth is a portal of entry for infectious agents 



