Studies on strains of Mycoplasma capricolum subsp. capripneumoniae isolated from outbreaks of contagious caprine pleuropneumonia in Eritrea

Autor: T. Tekleghiorghis, B. Houshaymi, D.R. Worth, Robin A.J. Nicholas, Roger J. Miles
Rok vydání: 2002
Předmět:
Zdroj: Small Ruminant Research. 45:139-143
ISSN: 0921-4488
Popis: Mycoplasmas were isolated from freeze-dried lung samples of goats from the Western lowlands of Eritrea suspected of being affected by contagious caprine pleuropneumonia (CCPP). The goats belonged to two herds in which mortality and morbidity rates were high. Mycoplasma capricolum subsp. capripneumoniae was identified in most samples by the polymerase chain reaction. Following cloning, M. capricolum subsp. capripneumoniae isolates were analysed biochemically and shown to be metabolically similar. They oxidised glucose, N -acetyl-glucosamine, pyruvate and l -lactate with a high affinity and mannose, glucosamine and 2-oxobutyrate with a low affinity. They were unable to utilise maltose, trehalose, fructose or ethanol. Major improvements were seen in the growth yield of the Eritrean strains with the addition of pyruvate to the medium. Thus, it may be that organic acids are important energy sources for these strains and may be used in addition to, or in place of, glucose. In contrast to most other strains of the M. mycoides cluster, the Eritrean strains produced large amounts of hydrogen peroxide during the oxidation of NADH by lysed cells. Previously, this characteristic was also reported for strain M . F38, the type strain of M. capricolum subsp. capripneumoniae , although, strain F38 did not metabolise sugars. Hydrogen peroxide has long been considered a pathogencity factor in mycoplasma infections.
Databáze: OpenAIRE
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