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Lower respiratory tract disease developed in a group of racehorses in training between two and six years of age. Disease was observed in 22 of 25 horses for which full records were available. Seroconversion to Mycoplasma felis was demonstrated by indirect haemagglutination assay in 19 of 22 paired sera and high titres (> or = 64) were found in convalescent sera from the three remaining horses. Evidence of respiratory viral infection was confined to seroconversions to equine herpesvirus-4 in two of the horses. Tracheal wash samples, taken from four horses with visibly increased tracheal mucopus, contained more than 10(4) colony forming units/ml M felis and high proportions of neutrophils. This is the first description of an outbreak of lower respiratory tract disease in horses in training associated with M felis infection.
Vet Rec 1997 Apr 12
PMID:An outbreak of respiratory disease in horses associated with Mycoplasma felis infection. 914 Dec 20

The clinical, ultrasonographic and radiographic findings in three cows and one bull with pleuropneumonia are described. All the animals had fever, indigestion, tachypnoea and abnormal lung sounds. Percussion of the thoracic wall elicited signs of pain and tests for foreign bodies were positive. Ultrasonographic examination revealed an accumulation of anechogenic to hypoechogenic fluid in the pleural space in the ventral thorax of all the animals. In one animal, echogenic bands of fibrin were observed between the thoracic wall and pulmonary surface. In another, parts of the right lung were not inflated because of severe bronchopneumonia. Radiographic examination revealed a pleural effusion, apparent as a horizontal fluid line, in three animals. In addition, the increased radiopacity in parts of the dorsal lung fields and increased bronchial and peribronchial markings suggested bronchopneumonia. In three animals, the radiographs revealed linear foreign bodies in the reticulum, suggesting that the pleuropneumonia was caused by the penetration of the foreign body into the thoracic cavity. A diagnosis of pleuropneumonia was made in all the animals on the basis of the clinical, ultrasonographic and radiographic findings and the analysis of the pleural fluid. The diagnosis was confirmed at slaughter in three of them; the fourth animal was treated and was clinically healthy when it was discharged.
Vet Rec 1997 Jul 05
PMID:Ultrasonographic findings in cattle with pleuropneumonia. 924 17

Minimum inhibitory concentrations of doxycycline and oxytetracycline were determined against 55 Pasteurella multocida strains, 59 Actinobacillus pleuropneumoniae strains and 26 Mycoplasma hyopneumoniae strains isolated from the respiratory tract of pigs. An additional set of 76 P multocida strains isolated from pneumonic pigs was tested for their minimum inhibitory concentrations of doxycycline. The P multocida and A pleuropneumoniae strains were isolated in France and the minimum inhibitory concentrations were determined by an agar dilution method. The M hyopneumoniae strains were isolated in the United Kingdom and minimum inhibitory concentrations were determined by a serial broth dilution method. All the strains tested were susceptible to doxycycline whereas 15 per cent of the P multocida strains and 22 per cent of the A pleuropneumoniae strains were resistant to oxytetracycline. Doxycycline concentrations inhibiting 90 per cent of strains were 1 microgram/ml for P multocida and 2 micrograms/ml for A pleuropneumoniae. The ratio of the minimum inhibitory concentrations of doxycycline and oxytetracycline ranged between 1/1 and 1/4 for the oxytetracycline-susceptible strains and between 1/16 and 1/64 for the oxytetracycline-resistant strains. All the M hyopneumoniae strains were susceptible to doxycycline and oxytetracycline, the concentrations inhibiting 90 per cent of strains being 1 microgram/ml and 2 micrograms/ml, respectively. These data confirm that doxycycline has a higher in vitro activity against pig respiratory pathogens than oxytetracycline.
Vet Rec 1997 Jul 12
PMID:Comparative in vitro activity of doxycycline and oxytetracycline against porcine respiratory pathogens. 925 29

An outbreak of contagious bovine pleuropneumonia (CBPP) was detected in Botswana in 1995 after more than half a century of freedom from the disease. Lung tissues, pleural fluids, nasal swabs and serum samples were examined in laboratories in Botswana, South Africa and Namibia and the findings were confirmed in Italy. The disease was confirmed as CBPP from the gross and histopathological changes in the lungs of affected animals and by the culture of the agent of CBPP, Mycoplasma mycoides subspecies mycoides, small colony variant (MmmSC). These findings were supported by the demonstration of specific complement-fixing antibodies and the production of polymerase chain reaction products of MmmSC.
Vet Rec 1998 Jul 11
PMID:An outbreak of contagious bovine pleuropneumonia in Ngamiland district of north-western Botswana. 969 52

The major causes of leg weakness/lameness were investigated in two male commercial broiler flocks. The numbers of dead and lame birds culled from the flocks each day were recorded by the flock managers. Forty-four lame birds and 22 sound birds were examined postmortem during a period of six weeks and the proximal and distal end of each femur, tibiotarsus and tarsometatarsus were examined histologically. Attempts were made to isolate bacteria and viruses from the proximal end of each femur. Blood samples were examined for antibodies to chicken anaemia virus (CAV), infectious bursal disease virus (IBDV) and Mycoplasma species. Bacterial chondronecrosis with osteomyelitis was identified in the proximal end of the femur of eight of the 44 lame birds, and in the proximal end of the tibiotarsus of a further bird (20.4 per cent). Gram-positive bacteria were present in all the lesions. Staphylococcus aureus was recovered from 62.5 per cent of the lesions confirmed by histology. Bacterial chondronecrosis associated with S aureus has thus been identified as an important cause of leg weakness in these commercial broilers. Lesions suggestive of the condition were visible macroscopically in only 11.1 per cent of the cases subsequently diagnosed by histology and bone histology is therefore required before a diagnosis can be excluded. Angular limb deformities (13.6 per cent) and spondylolisthesis (11.4 per cent) were the most common macroscopic lesions identified as causes of lameness. The overall incidence of tibial dyschondroplasia was similar in both the lame and sound broilers, but severe lesions were found only in lame birds (4.5 per cent).
Vet Rec 1998 Aug 01
PMID:Study of leg weakness in two commercial broiler flocks. 972 84

A multicentre, controlled, randomised and blinded study was carried out in three French pig herds to assess the efficacy of doxycycline administered in the feed for the control of pneumonia. About 20 per cent of 363 pigs from the three fattening units were diseased at the start of the study. Pneumonic lesions were found on pigs examined postmortem and Pasteurella multocida was isolated from the lungs of pigs in all the herds. Mycoplasma hyopneumoniae infection was confirmed either by detection in pneumonic lungs or by seroconversion in pigs sampled three weeks apart. P multocida, Bordetella bronchiseptica and Actinobacillus pleuropneumoniae were isolated from 64 per cent, 50 per cent and 2 per cent, respectively, of 148 nasal swabs. The following variables were significantly different between the treated and untreated groups (P < or = 0.001): the incidence of diseased pigs during the three weeks from the start of treatment (8.1 per cent in treated group v 35.4 per cent in control group), mean daily weight gain over the same period (934 g/day in the treated group v 834 g/day in the control group) and the cure rate of pigs which were diseased at the start of treatment (73.5 per cent in treated group v 35.3 per cent in control group). These data demonstrate that an average dose of 11 mg doxycycline/kg bodyweight per day in feed for eight days was effective in controlling pneumonia due to P multocida and M hyopneumoniae in these fattening pigs.
Vet Rec 1998 Sep 05
PMID:Efficacy of doxycycline in feed for the control of pneumonia caused by Pasteurella multocida and Mycoplasma hyopneumoniae in fattening pigs. 978 19

A total of 100 field isolates of Actinobacillus pleuropneumoniae isolated from lung tissues of pigs with severe pleuropneumonia were serotyped by slide agglutination and precipitation tests. Polymerase chain reactions for apxICA, apxIICA, apxIIICA, apxIBD and apxIIIBD genes were used to determine their genotype prevalence. Serotypes 2 (56 isolates), 5 (28 isolates) and 6 (11 isolates) were the most common; only two isolates belonged to serotype 7, and three were untyped. Among the 97 isolates identified by serotype, 70 had the same apx genes as their respective serotype reference strains, but 27 did not have any of the apx genes present in the corresponding serotype reference strain. Among these 27 isolates, 10 were serotype 2, 12 were serotype 5, three were serotype 6 and two were serotype 7.
Vet Rec 1999 Aug 28
PMID:Serotype and apx genotype profiles of Actinobacillus pleuropneumoniae field isolates in Korea. 1050 68

Postmortem observations of 37 cattle from an outbreak of contagious bovine pleuropneumonia (CBPP) in north Italy in 1993 were made at the abattoir, where samples of lung and tracheobronchial lymph node tissues were taken for culture and identification of Mycoplasma mycoides subspecies mycoides (MmmSC), immunohistochemistry with the peroxidase anti-peroxidase (PAP) system, and molecular detection by the polymerase chain reaction (PCR) amplification of specific DNA from MmmSC. Nasal swabs were also taken for testing by PCR Lung pathology typical of CBPP was observed in 38 per cent of the animals, and MmmSC was isolated from 19 per cent DNA of MmmSC was detected by PCR in 64 per cent of lung samples and 35 per cent of the nasal swabs. Staining of lung tissue and lymph node tissue by PAP was positive in 27 per cent and 30 per cent of cases, respectively, and was a useful back-up test. These results suggest that PCR amplification from lung tissue may be used as a rapid and accurate confirmatory test for cases with pathology resembling CBPP.
Vet Rec 1999 Sep 04
PMID:Detection of Mycoplasma mycoides subspecies mycoides in tissues from an outbreak of contagious bovine pleuropneumonia by culture, immunohistochemistry and polymerase chain reaction. 1057 36

Minimum inhibitory concentrations (MIC) and minimum mycoplasmacidal concentrations (MMC) of the antimicrobials danofloxacin, florfenicol, oxytetracycline, spectinomycin and tilmicosin were determined in vitro for 20 isolates of Mycoplasma mycoides subspecies mycoides small colony type (MmmSC), the causative agent of contagious bovine pleuropneumonia (CBPP). The majority of strains were most susceptible to tilmicosin, followed by danofloxacin, oxytetracycline, florfenicol and spectinomycin with MIC50 values of 0.015, 0.25, 0.5, 1 and 8 microg/ml, and MMC50 values of 0.06, 0.5, 8, 8 and 16 microg/ml, respectively. However, tilmicosin had poor mycoplasmacidal activity against two recent strains from Portugal. There was no evidence of resistance to danofloxacin in any of the strains.
Vet Rec 2000 Feb 26
PMID:Comparison of in vitro activity of danofloxacin, florfenicol, oxytetracycline, spectinomycin and tilmicosin against Mycoplasma mycoides subspecies mycoides small colony type. 1073 93

An indirect ELISA was used to detect antibodies to Mycoplasma bovis in milk samples collected from a herd with M bovis mastitis. Antibodies were detected in samples from nine cows which had developed clinical M bovis mastitis. Milk from only three consistently antigen-negative cows tested positive for M bovis antibodies. These results indicate the potential value of the indirect ELISA for the detection of cows which have recently developed M bovis mastitis during the early stages of an outbreak.
Vet Rec 2000 Mar 25
PMID:Application of an indirect ELISA to milk samples to identify cows with Mycoplasma bovis mastitis. 1080 81


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