The knowledge that a given disease is of parasitic origin is but a part of its etiological study. We must complete our information by learning the mode of dissemination and transfer of the parasite, and by examining all condition and factors, which bear on the possibility of infection. Let us, in the first place, trace the; distribution of microbes from the infected patient to others.
The simplest problems we will meet in the case of venereal diseases. Gonorrhœa and genital chancres are always the result of direct contact with other infected individuals. But chancres on other parts of the body have often been transferred through media, such as pipes, tools held in the mouth, unclean surgical instruments or tatooing needles. The syphilitic virus can evidently retain its vitality for hours, or possibly a few days while clinging to objects outside of the body. The possibility of the mediate
GRADLE H. LECTURES ON GENERAL ETIOLOGY.Delivered at the Chicago Medical College. JAMA. 1892;XVIII(14):420–424. doi:10.1001/jama.1892.02411180012001c
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