Studies of the Pathogenic Avian Haemophili

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Abstract
Biochemical and physiological characteristics of 35 avian haemophili strains from 7 countries were examined. All strains required V-factor but not X-factor for growth on artificial media. They produced acid in phenol-red broth containing fructose, glucose and mannose. Acid production from other carbohydrates was variable or did not occur. Of the strains, 32 were pathogenic to chickens. Pathogenicity varied with method of exposure. Hyaluronic acid was found in 9 strains. Hemagglutination of human or chicken erythrocytes was inhibited by its presence. Antimicrobial sensitivity patterns showed that all strains were sensitive to chloromycetin, erythromycin, furoxone, gentamicin, nalidixic acid, neomycin, novobiocin, spectinomycin and tetracycline.