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Pleuropneumonia caused by haemophilus pleuropneumoniae haemophilus parahaemolyticus in swine iii. epizootiologico clinical experiences and diagnosis



Pleuropneumonia caused by haemophilus pleuropneumoniae haemophilus parahaemolyticus in swine iii. epizootiologico clinical experiences and diagnosis



Magyar Allatorvosok Lapja 40(12): 723-728



Experiences are summarized that were obtained on the epizootiological characteristics and clinical features of pleuropneumonia caused by Haemophilus pleuropneumoniae (HPP) in swine under field conditions. Results of laboratory investigations that confirmed the practical experiences are also summarized. Some aspects of differential diagnosis are also treated. The more important establishments are, as follows. In accordance with Nicolet et al. (1969), the clinical signs have been divided into three general headings: hyperacute, acute and chronic. The rate of morbidity and mortality.sbd.in accordance with the literature.sbd.varies significantly in Hungary, as well. Comparing the epizootiologico-clinical course of the disease observed in the individual farms to the data of isolation, it was pointed out that besides the size of stock, hygienic conditions, seasons, frontal passages, as well as serotype of the causative agent, rate of morbidity and mortality is highly influenced by the virulence grade of the causative agent and by the immune states of the stock. It seems that significant differences exist among the virulence of the individual bacterium strains. The antibodies disappear from the blood sera of the piglets from non-immunized sows with different grade of immunity at the age of 40 to 50 days. This is the reason why.sbd.according to the technology and other conditions on the farms.sbd.the disease appears generally among the 8 to 14 weeks old pigs. This should also be considered in the elaboration of the vaccination program. The diagnosis of the disease may generally be established on the basis of the epizootiological data, clinical features and pathological alterations. The characteristic histological changes, isolation of the causative agent or its demonstration by direct fluorscent antibody technique, as well as by the serological examination of the stock confirm more exactly the diagnosis.

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