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The effectiveness of orally administered tylosin tartrate for the control of naturally occurring pneumonia was determined in 287 neonatal calves. Tylosin tartrate was mixed with reconstituted milk replacer at the time of feeding. Daily doses of 1.0 g (0.5 g BID), 2.0 g (1.0 g BID) and 4.0 g (2.0 g BID) were evaluated for periods ranging from seven to 28 days. Tylosin at the optimum dose of 2.0 g daily reduced mortality to 12 out of 95 (12.6 per cent) compared to 38 out of 89 (42.7 per cent) in the non-medicated control calves. The 1.0 g daily dose did not reduce mortality. The number of calves with moderate to severe lung lesions was also reduced by treatment at 2.0 g daily to 13 out of 95 (13.7 per cent) compared to 45 out of 89 (50.6 per cent) in the control group. All dose levels had a similar effect in reducing the severity of clinical signs indicative of respiratory disease. Tylosin treatment at all dose levels reduced the number of Pasteurella multocida isolations from lung tissue to 15/146 (10.3 per cent) compared to 61/141 (43.3 per cent) for the controls. However, there were no differences between treated and controls in the number of P haemolytica isolations. The frequency of mycoplasma isolations from lung tissue were reduced significantly by tylosin treatment at the 4.0 g and 2.0 g dose levels to 36/93 (38.7 per cent) compared to 61/86 (70.9 per cent) for the control calves.
Vet Rec 1980 Aug 16
PMID:Orally administered tylosin for the control of pneumonia in neonatal calves. 744 93

The pathogenesis of acute bovine pulmonary oedema and emphysema (ABPE) is related to the ruminal formation of 3-methylindole (3MI) from L-tryptophan (TRP), a naturally occurring amino acid and constituent of forage. The objectives of the present study were to determine whether monensin and lasalocid, both polyether antibiotics, were effective in reducing ruminal conversion of TRP to 3MI in vivo and to confirm that reduction in ruminal conversion of TRP to 3MI prevented tryptophan induced ABPE. Sixteen mature Hereford cows were assigned to one of four groups and given TRP to induce ABPE. Group 1 was given 100 mg monensin orally twice daily starting one day before and ending four days after TRP dosing. Group 2 was given 200 mg monensin once daily and group 3 was given 100 mg lasalocid twice daily. Group 4, the control, was given only TRP without further treatment. All control cows developed clinical signs of respiratory disease and lesions of ABPE; one control cow died of ABPE. Mean ruminal 3MI concentrations in control cows reached a peak of 36.4 micrograms per ml. Clinical signs of pulmonary disease appeared in two cows treated with lasalocid and one died. Mean ruminal 3MI in these animals peaked at 38.8 micrograms per ml. No clinical signs of respiratory disease were observed in any of the monensin treated cows and at necropsy there were no pulmonary lesions of ABPE. Mean ruminal 3MI concentrations in monensin treated cows did not exceed 8.9 micrograms per ml. In all groups plasma 3MI concentrations generally reflected ruminal 3MI concentrations but at lower concentrations. The results of this experiment demonstrate that reduction in ruminal 3MI formation by monensin prevents tryptophan induced ABPE.
Vet Rec 1980 Oct 04
PMID:Prevention of tryptophan-induced acute bovine pulmonary oedema and emphysema (fog fever). 746 89

Porcine reproductive and respiratory syndrome (PRRS) was first known as blue-eared pig disease in the United Kingdom and the causative agent as 'Lelystad virus'. The disease is characterised by very variable clinical signs, including reproductive failure and respiratory disease. The respiratory syndrome is often associated with severe infection with secondary bacterial agents including Pasteurella multocida, Haemophilus parasuis and Streptococcus suis. However, some seropositive herds show no clinical signs of disease. The secondary infections may be facilitated by the destruction of circulating lymphocytes, by the destruction of the mucociliary clearance system and, most importantly, by a large reduction in the numbers of alveolar macrophages. The clinical syndrome observed in a herd may therefore depend in part upon the other diseases present.
Vet Rec 1995 Jan 14
PMID:Porcine reproductive and respiratory syndrome: clinical disease, pathology and immunosuppression. 770 69

The prevalence of infections with H1N1- and H3N2-influenza viruses, porcine respiratory coronavirus (PRCV), transmissible gastroenteritis virus (TGEV) and porcine epidemic diarrhoea virus (PEDV) in feeder pigs shortly after their entry into fattening units was examined. Ten groups of pigs with acute respiratory disease during the months September to October 1991 and seven groups of pigs with acute diarrhoea during the months February to March 1992 were investigated. On arrival in the fattening herds, more of the pigs were negative for antibodies against H1N1-influenza virus and against PRCV during September to October (61 and 50 per cent, respectively) than in February to March (51 and 34 per cent, respectively). There was serological evidence of a triple infection with PRCV and both influenza viruses in seven of the 17 groups; dual infections with PRCV and H1N1-influenza virus occurred in nine groups and with H1N1- and H3N2-influenza viruses in one group. Seroconversion against TGEV was not detected in any of the 17 groups, but seven of them had seroconverted to PEDV. Multiple infections with PRCV and either one or both of the influenza viruses were thus very common shortly after the introduction of feeder pigs into the fattening herds. There was no association between the type and/or multiplicity of these infections and respiratory disease, but infections with PEDV were clearly associated with outbreaks of diarrhoea.
Vet Rec 1994 Dec 17
PMID:Prevalence of infections with enzootic respiratory and enteric viruses in feeder pigs entering fattening herds. 790 Feb 43

A severe outbreak of undifferentiated respiratory disease affecting 119 of 144 (82.6 per cent) two- to five-month-old housed beef calves was studied by monitoring their clinical signs and rectal temperatures daily or every second day for two months. New cases of respiratory disease, which were first identified three weeks after the calves were housed, occurred over a period of 29 days. The cause of the outbreak was not conclusively determined although 20 per cent of the calves sampled showed serological evidence of recent infection with bovine respiratory syncytial virus and parainfluenzavirus 3. Seventeen of 61 calves (27.9 per cent) which were treated with tilmicosin had to be treated again, compared with nine of 58 calves (15.5 per cent) which were treated with both tilmicosin and flunixin meglumine and did not need further treatment, but this difference was not statistically significant.
Vet Rec 1994 Mar 26
PMID:Field study of undifferentiated respiratory disease in housed beef calves. 820 7

Market-purchased, week-old, dairy bred calves entering a commercial calf-rearing unit were blood sampled at six-week intervals until three months old. Viral infections were monitored by ELISA for antibodies to bovine herpesvirus 1, bovine respiratory syncytial virus, parainfluenzavirus-3, bovine adenovirus subgroup 1 and bovine viral diarrhoea virus (BVDV). The immunoperoxidase test was used to detect BVDV in serum. The total immunoglobulin concentration in the initial blood sample was measured by the zinc sulphate turbidity test. The relationship between clinical respiratory disease, viral seroconversion and the initial concentration of serum immunoglobulin was investigated by the use of the relative risk statistic, Fisher's exact test, chi 2 techniques and the correlation coefficient. Treatment rates for respiratory disease of 45 per cent were observed during the first period of the study and 19 per cent during the second period. During the first period there was a significant positive association between clinical respiratory disease and seroconversion for all the viruses except parainfluenzavirus-3 and BVDV but in the second period there was no such relationship. Similarly, in the first period, but not in the second, there was a significant negative association between clinical respiratory disease and both antiviral immunoglobulin as measured by ELISA and total immunoglobulin as measured by the zinc sulphate turbidity test. Two of the 536 calves that survived to three months of age were found to be persistently infected with BVDV.
Vet Rec 1993 Jul 24
PMID:Associations between viral infections and respiratory disease in artificially reared calves. 821 94

Four eight-week-old cats, shown to be free from feline calicivirus, feline herpesvirus and Chlamydia psittaci were challenged with an aerosol of Bordetella bronchiseptica. Within five days the cats developed signs of respiratory disease, characterised by nasal discharge, sneezing, spontaneous or induced coughing and dry or wet rales at auscultation. These signs were present for about 10 days, after which they began to resolve. To test the protective capacity of an experimental fimbrial antigen-based subunit vaccine, 10 kittens were vaccinated twice, with two weeks between the vaccinations, and five kittens were left unvaccinated. Two weeks after the booster the 15 kittens were challenged with an aerosol of B bronchiseptica as the sole pathogen. On the day of challenge the vaccinated kittens had a mean bordetella antibody titre of 2(9.5) whereas the control cats remained seronegative (titre < 2(2)). The control cats developed signs of respiratory disease after challenge, whereas the vaccinated cats were almost completely protected. The degrees of protection against rhinitis, sneezing, spontaneous or induced coughing, and dry or wet rales at auscultation were 100 per cent, 95 per cent, 95 per cent and 100 per cent, respectively. Furthermore, the vaccinated kittens cleared the challenge bacteria more quickly than the controls, resulting in a reduction of 80 per cent on days 15 and 18 after challenge and a reduction of 99 per cent on days 22 and 29 after challenge. The results show that B bronchiseptica can act as a primary pathogen in cats and that a vaccine containing the fimbrial antigen induces a protective immune response.
Vet Rec 1993 Sep 11
PMID:Feline bordetellosis: challenge and vaccine studies. 823 48

In July 1989 influenza A/equine-2 (H3N8) was isolated from a nasopharyngeal swab taken from a non-thoroughbred horse exhibiting acute clinical respiratory disease. This was the first isolation of equine influenza virus in the United Kingdom since 1981. Subsequent investigations of acute respiratory disease in horses indicated that the infection was dispersed throughout the UK. However, unlike the previous epidemic of 1979, the first horses from which the virus was isolated had been vaccinated. This outbreak of influenza provided an opportunity to evaluate an antigen capture ELISA, directed against the influenza virus nucleoprotein, as a rapid method for detecting virus in the nasopharyngeal secretions of naturally infected horses.
Vet Rec 1993 Nov 20
PMID:The outbreak of equine influenza (H3N8) in the United Kingdom in 1989: diagnostic use of an antigen capture ELISA. 831 Jun 27

One hundred and thirteen isolates of feline calicivirus originating from seven different clinical groups were typed by virus neutralisation tests using eight different cat antisera. The clinical groups comprised 'healthy' cats, cases of acute oral/respiratory disease, chronic stomatitis, acute febrile lameness syndrome, vaccine reactions (clinical disease seen within 21 days of vaccination) and vaccine breakdowns (clinical disease seen more than 21 days after but within one year of vaccination). Isolates from the vaccine reaction cases were grouped into those associated with acute oral/respiratory disease alone and those associated with the lameness syndrome, and the latter group was further subdivided according to the vaccine used. Two groups appeared significantly different from others with some of the antisera. Thus the lameness vaccine reaction isolates associated with vaccine B were significantly different from the isolates from all the other clinical groups, including other lameness isolates, with a number of the antisera. In addition, the chronic stomatitis isolates were significantly different from those from the 'healthy' and the acute oral/respiratory disease groups with one or two of the antisera. Eighty-five to 88 per cent of the isolates were neutralised by antisera raised against F9 or F9-like vaccine strains at a dilution of 1 in 2. Twenty antibody units of such antisera neutralised 42 to 80 per cent of the isolates. A bivalent antiserum raised against a vaccine F9 strain and field strain LS015 neutralised 96 per cent of the isolates at a dilution of 1 in 2, and 20 antibody units neutralised 68 per cent of isolates. Antisera to field strain F65 neutralised all the remaining isolates at a dilution of 1 in 2 and 44 per cent of the remaining isolates at a dilution of 20 antibody units. Therefore, strains LS015 and F65 may be of use in the production of a polyvalent feline calicivirus vaccine, together with the widely used strain F9.
Vet Rec 1993 Jul 03
PMID:Typing of feline calicivirus isolates from different clinical groups by virus neutralisation tests. 836 84

The clinical and epidemiological features of feline calicivirus associated vaccine reactions and breakdowns were investigated. Twenty per cent of 123 vaccine reactions were associated with acute oral/respiratory disease alone, and 80 per cent were associated with lameness either alone or in association with other clinical signs. Feline calicivirus was isolated from oropharyngeal swabs from 69 per cent of the vaccine reaction cases. Twenty-four of 31 vaccine breakdowns were associated with acute oral/respiratory disease and only seven with lameness; the virus was isolated from 28 of the 31 breakdowns. Some of the viruses isolated from the vaccine reactions were compared with the appropriate vaccine virus in virus neutralisation tests; the majority appeared to be different from the vaccine virus and were presumably field viruses. However, some appeared more similar to the vaccine virus and the majority of these were associated with lameness after the first vaccination.
Vet Rec 1993 Apr 03
PMID:Investigation of vaccine reactions and breakdowns after feline calicivirus vaccination. 838 16


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