Cold Agglutinins

Abstract
The availability of new methods for the isolation and study of viral diseases and the discovery of new groups of viruses related to nonbacterial respiratory infections with the use of these methods1have shed some light on the etiology of a small proportion of the infections that have been recognized under the vague name "primary atypical pneumonia," commonly referred to as "virus pneumonia." In 1943, Peterson, Ham, and Finland,2after encountering three patients with acute hemolytic anemia associated with cold agglutinins (autohemagglutinins) among such cases, studied this phenomenon and found that the great majority of cases of primary atypical pneumonia seen at the Boston City Hospital during that season showed significant titers of cold isohemagglutinins in their serum. At about the same time, Turner3made a similar observation among military personnel stationed in England. More extensive studies by Turner and Finland and their respective co-workers4-6indicated

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