HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Beckman, H. Search for Related Content PubMed Articles by Beckman, H.

An Experimentally Derived Method for Determining the Degree of Infection in Avian Malaria¹

The 226 positive and 172 negative smears accruing during the daily (in some instances every second day) examination of the peripheral blood of fifty canaries mosquito-infected with Plasmodium cathemerium (Hartman) have been studied with the object of arranging them according to the time required to count a given number of asexual organisms. It was observed that the rate of progression and diminution in these infections occurred in such manner that a system of plus counting could be devised as follows.

1. Negative—No organisms in 3 minutes
   
2. 1+—Less than twenty organisms in 3 minutes
   
3. 2+—Twenty organisms in 2 to 3 minutes
   
4. 3+—Twenty organisms in 1 to 2 minutes
   
5. 4+—Twenty organisms in 30 to 60 seconds
   
6. 5+—Twenty organisms in 30 seconds or less
   

¹ The work was partially supported by a grant from the Committee on Therapeutic Research of the American Medical Association.