"Cara inchada" são de bovinos, ns periodontite infecciosa, aparentemente desencadeada através dos antibióticos do solo

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The target of this análise on ns investigation that "cara inchada" in cattle (CI), pursued over the last 30 years, was to elucidate a pathogenicity of ns disease and come to ideal conclusions ~ above its etiology. CI has been widely thought about to it is in of nutritional origin, caused primarily by água com gás deficiency or imbalance. However, the disease consists of naquela rapidly progressivo periodontitis, affecting ns periodontal organization at a level of ns premolars and molars during a period of this eruption generally starting in young calves. A disease led to good economic losses ao farmers in central-western Brazil, after a occupation of novo land porque o cattle raising in the 1960s and 1970s. The lateral enlargement of the maxillary skeleton of impacted calves gave the disease the difundido name that "cara inchada", i.e., swollen or enlarged face. Ns enlargement era found to be due to naquela chronic ossifying periostitis resulting são de the purulent alveolitis of CI. Black-pigmented non-saccharolytic Bacteroides melaninogenicus, constantly together com Actinomyces (Corynebacterium) pyogenes, were isolated in huge numbers são de the periodontal lesions. B. Melaninogenicus can be isolated in small numbers also são de the marginal gingiva of a few healthy calves preserved on CI-free farms. "In vitro"-assays showed that streptomycin and actinomycin, too as ns supernatants of cultivates of actinomycetes em ~ soils of CI-prone farms, applied in subinhibitory concentrations to a bacteria tested, magnified significantly (up come 10 times) the adherence of a black-pigmented B.melaninogenicus to epithelial cell of ns bovine gingiva. Ns antibiotics are apparently produced in big quantities by the increased variety of soil actinomycetes, including the genus Streptomyces, that construct when floor microflora are modified through cultivating virgin forest or "Cerrado" (tree-savanna) for the o primeiro dia time para cattle grazing. A epidemiology that CI agora provides strong evidence that the ingestion with the forage of such antibiotics can possibly be crucial determinant fator for a onset and development that this contagious periodontitis. Ns antibiotic enhanced adherence that B.melaninogenicus to a sulcus-epithelium of a marginal gingiva, is believed to enable it come colonize, form a plaque and become pathogenic. There is experimentar evidence that this determinant fator for the development of a periodontitis is present likewise in ns milk of the mothers the CI-diseased calves. It has actually been displayed that a bacteria isolated em ~ the periodontal CI-lesions produce enzymes and endotoxins capable of destroying the periodontal tissues. The epidemiology of CI, with its decline in incidence and its loss after several years, can be described by a fact that a former equilibrium of a microflora that the once undisturbed virgin soil has actually been reached novamente and that ns number that antibiotic developing actinomycetes has actually been anew reduced. By this reasoning and tudo de the encontro available, CI should be considered as naquela multifactorial contagious disease, led to primarily by ns anaerobic black-pigmented non-saccharolytic Bacteroides melaninogenicus, constantly together with the micro-anaerobic Actinomyces pyogenes. Accordingly, a onset e development of ns infectious periodontitis is apparently determined by gulp down with a forage that subinhibitory concentrations of antibiotics developed in recently grew virgin soils. This hypothesis is supported by a recent monitoring of renewed outbreaks of CI-periodontitis in previous CI-prone areas, following fresh cultivation after numerous years.

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The infectious natureza of CI is confirmed by trials in i beg your pardon virginiamycin was used efficiently porque o the oral treatment of CI-diseased cattle. Formerly it has been shown, the spiramycin and virginiamycin, supplied as additive in mineral supplements, prevented CI-periodontitis.

"Cara inchada"; cattle; periodontitis; Bacteroides melaninogenicus; determinant factor; floor antibiotics; streptomycin; actinomycin