We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Article |


JAMA. 1956;160(5):393. doi:10.1001/jama.1956.02960400051014.
Text Size: A A A
Published online


It is difficult to realize now that prior to 1913 the causal relationship between dysentery and Endamoeba histolytica was in doubt, although it had been suspected since 1875.1 Since 1925, the idea that this ameba is an absolute pathogen nourished entirely by the tissues of the host has been giving way to the idea that motile or trophic amebas may exist in the lumen of the intestinal tract, where they ingest bacteria and particles of the intestinal content; they may be found containing no ingested erythrocytes. This in part explains the fact that most infected persons are apparently carriers of amebas with no evidence of disease resulting from the host-parasite relationship. As pointed out by Brown and his coworkers (this issue, page 360) the incidence of intestinal infection with E. histolytica in this country is between 5 and 20%, varying with geographical location and standards of hygiene and sanitation.


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

First Page Preview

View Large
First page PDF preview




Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.