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STUDIES ON EMMONSIELLA CAPSULATA (HISTOPLASMA CAPSULATUM): II. DISTRIBUTION OF THE TWO MATING TYPES IN 13 ENDEMIC STATES OF THE UNITED STATES
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1974
Year
The United StatesParasitic DiseaseDiagnostic MycologyPathogenic MicrobiologyThirty-nine Soil IsolatesHistoplasma CapsulatumSoil IsolatesParasitologyHost-parasite RelationshipMating TypesFungal PathogenBiologyEndemic StatesNatural SciencesEvolutionary BiologySoil-transmitted HelminthiasisMicrobiologyHost ResistanceMedicine
The distribution of the two mating types in soil and among isolates from human infection was studied. Nine hundred thirty-nine soil isolates and 184 clinical isolates obtained from 13 states in which the organism is endemic were tested for their mating types. The ratio of + and –types among soil isolates was 1: 1, whereas among the clinical isolates there was a 7 (−): 1 (+) ratio. The mycelia of the – type converted to the unicellular form in vitro more readily than the + type.