CH. 21 DISEASES OF THE RESPIRATORY TRACT
What types of microbes can invade skin? Of the five classes of microbes that cause human disease--viruses, bacteria, fungi, single-cell protozoans, and multicellular helminths or worms--only helminths can penetrate unbroken skin; for example, the larvae of Schistosomiasis mansoni can directly invade the skin of the feet of those wading barefoot ... ................
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