21:I[432972,["/_next/static/chunks/bb923814e1f4d2e9.js","/_next/static/chunks/dd3ee9f5b7716ca6.js","/_next/static/chunks/4204a0ae82542ca8.js","/_next/static/chunks/1270dead247da766.js","/_next/static/chunks/6e1aa89a642f40be.js","/_next/static/chunks/b3eb9795ffa7b0d3.js","/_next/static/chunks/8ffd0b71567920d8.js","/_next/static/chunks/67ea6dfd21f16c5f.js","/_next/static/chunks/24eb4379f68013fd.js","/_next/static/chunks/b8cd775ffdf935bd.js","/_next/static/chunks/983103cd9eb7b428.js","/_next/static/chunks/263f2cdcb9aa2341.js","/_next/static/chunks/294b9525248c8e5f.js"],"default"] 22:T48c,IN A number of historic developments within the past two decades, the microorganism known as the Eaton agent was shown to be a principal cause of primary atypical pneumonia in man.^1-14Originally considered to be a virus,⁵it was later characterized as a filterable agent which grows extracellularly with the properties of a pleuropenumonia-like organism (PPLO).^15-19It has been classified asMycoplasma pneumoniae.²⁰Clinical, seroepidemiologic, and controlled therapeutic studies in military populations,^21-27prison volunteers,^28,29industrial employees,¹³pediatric ward patients,^30,31and in college students³²have indicated the important and pathogenic role ofM pneumoniaein the causation of human respiratory disease and its susceptibility to tetracycline. Our study was undertaken to further determine among civilian adults the occurrence and significance of PPLO in patients with various types of respiratory illnesses.

Materials and Methods

From August 1963 to April 1964, 197 patients hospitalized for pneumonia in the medical wards of the

#	Concept	H-Index	Publications	Citations
1	Medicine	5	5	275
2	Microbiology	4	4	216
3	Immunology	2	2	69
4	Health Sciences	1	1	123
5	Epidemiology	1	1	59

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