noun Pathology.
reinfection by a pathogen that is already in the body.
infection caused by transfer of a pathogen from one part of the body to another.

1900–05; auto-1 + infection Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autoinfection (ˌɔːtəʊɪnˈfɛkʃən)
infection by a pathogenic agent already within the body or infection transferred from one part of the body to another

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

autoinfection au·to·in·fec·tion (ô'tō-ĭn-fěk'shən)

  1. Reinfection by microbes or parasitic organisms that are present on or within the body.

  2. Self-infection by direct contact with a contagious agent, as with parasite eggs in the infectious state transmitted by fingernails. Also called autoreinfection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Humans are infected either by ingestion of food contaminated with feces, or by autoinfection.
Human infection can result from either ingestion of contaminated food or by autoinfection.
The frequency of autoinfection in individuals with taeniasis is not known.
Autoinfection may continue for the period of nasal colonization.
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