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== Introduction ==

== Introduction ==

Contagious caprine pleuropneumonia ('''CCPP''') is a cause of major economic losses to goat producers in Africa and Asia.

Contagious caprine pleuropneumonia ('''CCPP''') is a cause of major economic losses to goat producers in Africa and Asia.

 

This condition is caused by ''[[Mycoplasma capricolum subsp. capricolum|Mycoplasma capricolum ''subsp.'' capricolum]]'' and occasionally ''M. mycoides'' subsp. ''capri'' or [[Mycoplasma mycoides subsp. mycoides|''M. mycoides'' subsp. ''mycoides'']]. It is a member of the ''Mycoplasma mycoides'' cluster.

This condition is caused by members of the [[Mycoplasmas species - Overview|Mycoplasma genus]], usually ''Mycoplasma capricolum subsp. capricolum'' but occasionally also ''M. mycoides'' subsp. ''capri'' or [[Mycoplasma mycoides subsp. mycoides|''M. mycoides'' subsp. ''mycoides'']]. Both are members of the ''Mycoplasma mycoides'' cluster.

 

CCPP is characterized primarily by its '''contagious nature'''. The disease causes '''interstitial fibrinous pleuropneumonia''', interlobular oedema and hepatization of the lung causing high mortality rates of up to 80% and morbidity rates of up to 100%.  

CCPP is characterized primarily by its '''contagious nature'''. The disease causes '''interstitial fibrinous pleuropneumonia''', interlobular oedema and hepatization of the lung causing high mortality rates of up to 80% and morbidity rates of up to 100%.  

 

The most important distinguishing features of CCPP, with respect to the other goat respiratory mycoplasmoses, were defined by Hutcheon and are quoted as follows:  

The most important distinguishing features of CCPP, with respect to the other goat respiratory mycoplasmoses, were defined by Hutcheon and are quoted as follows:  

==Distribution==

==Distribution==

CCPP has been detected in at least 30 countries across '''Africa, the Middle East and Western Asia'''.

CCPP has been detected in at least 30 countries across '''Africa, the Middle East and Western Asia'''.

 

In natural infections, transmission of the disease is by aerosol.  

In natural infections, transmission of the disease is by aerosol.  

 

The '''environment''' also plays an important role in the appearance, evolution and severity of CCPP. Due to the high sensitivity of mycoplasmas to the external environment, '''close contact is essential''' between infected and naive animals for transmission to take place, and '''overcrowding and confinement''' thus favours their circulation. Stress factors such as malnutrition and long transport can also predispose animals to disease. In Africa where extensive and traditional husbandry is practised, pathogens spread when animals meet at watering points and grazing areas.  

The '''environment''' also plays an important role in the appearance, evolution and severity of CCPP. Due to the high sensitivity of mycoplasmas to the external environment, '''close contact is essential''' between infected and naive animals for transmission to take place, and '''overcrowding and confinement''' thus favours their circulation. Stress factors such as malnutrition and long transport can also predispose animals to disease. In Africa where extensive and traditional husbandry is practised, pathogens spread when animals meet at watering points and grazing areas.  

==Signalment==

==Signalment==

CCPP affects only goats, of any breed, sex or age worldwide. Younger animals tend to suffer more severe clinical signs than adults.

CCPP affects only goats, of any breed, sex or age worldwide. Younger animals tend to suffer more severe clinical signs than adults.

== Clinical Signs ==

== Clinical Signs ==

The animal may appear generally '''depressed, dull, weak and lethargic'''. The animal will then be pyrexic and have signs of '''weight loss''' of reduced weight gain.  

The animal may appear generally '''depressed, dull, weak and lethargic'''. The animal will then be pyrexic and have signs of '''weight loss''' of reduced weight gain.  

 

If the animal is in milk then milk yield will be severely reduced. Sometimes the disease may manifest as '''sudden death''' only.  

If the animal is in milk then milk yield will be severely reduced. Sometimes the disease may manifest as '''sudden death''' only.  

 

Respiratory signs include '''bilateral nasal discharge, dyspnoea, tachypnoea and coughing'''. Some goats may appear to be in severe respiratory distress.

Respiratory signs include '''bilateral nasal discharge, dyspnoea, tachypnoea and coughing'''. Some goats may appear to be in severe respiratory distress.

 

== Pathology ==

== Pathology ==

The gross pathological lesions are localized exclusively to '''lung and pleura''' and are often unilateral. Affected lungs can be totally hepatized, and have a '''port wine colour'''<ref>Thiaucourt, F., Bölske, G (1996) '''Contagious caprine pleuropneumonia and other pulmonary mycoplasmoses of sheep and goats'''. ''Revue Scientifique et Technique - Office International des épizooties'', 15(4):1397-1414; 69</ref>. A lung section shows a fine granular texture with various colours, but usually without any thickening of the interlobular septa.  

The gross pathological lesions are localized exclusively to '''lung and pleura''' and are often unilateral. Affected lungs can be totally hepatized, and have a '''port wine colour'''<ref>Thiaucourt, F., Bölske, G (1996) '''Contagious caprine pleuropneumonia and other pulmonary mycoplasmoses of sheep and goats'''. ''Revue Scientifique et Technique - Office International des épizooties'', 15(4):1397-1414; 69</ref>. A lung section shows a fine granular texture with various colours, but usually without any thickening of the interlobular septa.  

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Abundant '''pleural exudate and pleuritis''' are common. The pleural exudates may have solidified forming a '''gelatinous covering.'''

Abundant '''pleural exudate and pleuritis''' are common. The pleural exudates may have solidified forming a '''gelatinous covering.'''

 

In acute cases, the pleural cavity contains an excess of '''straw-coloured fluid''' with fibrin flocculations <ref>Wesonga, H. O., Lindberg, R., Litamoi, J. K., Bölske, G (1998) '''Late lesions of experimental contagious caprine pleuropneumonia caused by ''Mycoplasma capricolum'' ssp. ''capripneumoniae''.''' ''Journal of Veterinary Medicine.'' Series B, 45(2):105-114; 22</ref>. In chronic cases there is a '''black discolouration''' of the lung tissue and sequestration of necrotic lung areas.  

In acute cases, the pleural cavity contains an excess of '''straw-coloured fluid''' with fibrin flocculations <ref>Wesonga, H. O., Lindberg, R., Litamoi, J. K., Bölske, G (1998) '''Late lesions of experimental contagious caprine pleuropneumonia caused by ''Mycoplasma capricolum'' ssp. ''capripneumoniae''.''' ''Journal of Veterinary Medicine.'' Series B, 45(2):105-114; 22</ref>. In chronic cases there is a '''black discolouration''' of the lung tissue and sequestration of necrotic lung areas.  

 

'''Adhesions''' between the lung and the pleura are very common and often very thick <ref>MacOwan, K. J., Minette, J. E (1977) '''The role of Mycoplasma strain F38 in contagious caprine pleuropneumonia (CCPP) in Kenya.''' ''Veterinary Record'', 101:380-381</ref>

'''Adhesions''' between the lung and the pleura are very common and often very thick <ref>MacOwan, K. J., Minette, J. E (1977) '''The role of Mycoplasma strain F38 in contagious caprine pleuropneumonia (CCPP) in Kenya.''' ''Veterinary Record'', 101:380-381</ref>

 

Histological examination of the lung tissues may show acute '''serofibrinous to chronic fibrino-necrotic pleuropneumonia''' with neutrophilic inflammation in the alveoli, bronchioles, interstitial septae and subpleural connective tissue. Intralobular oedema is prominent and local lymphoid hyperplasia common.

Histological examination of the lung tissues may show acute '''serofibrinous to chronic fibrino-necrotic pleuropneumonia''' with neutrophilic inflammation in the alveoli, bronchioles, interstitial septae and subpleural connective tissue. Intralobular oedema is prominent and local lymphoid hyperplasia common.

== Diagnosis ==

== Diagnosis ==

'''High mortality and typical early thoracic lesions''' in goats are highly indicative of ''M. capricolum'' subsp. ''capripneumoniae'' infection, but are not diagnostic.

'''High mortality and typical early thoracic lesions''' in goats are highly indicative of ''M. capricolum'' subsp. ''capripneumoniae'' infection, but are not diagnostic.

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A valuable 'in the field' diagnostic procedure is the '''[[Agglutination|latex agglutination test]]'''(LAT)<ref>Rurangirwa FR, McGuire TC, Musoke AJ, Kobore A (1987) '''Differentiation of F38 Mycoplasmas causing contagious caprine pleuropneumonia with a growth-inhibiting monoclonal antibody.''''' Infection and Immunity'', 55:3219-3220</ref>. The long shelf-life of the beads at different temperatures makes it possible to prepare large amounts which can be stored until used. This combined with the rapidity of the test, being run in two minutes, makes it a practical and useful test.

''M.capricolum'' can be identified by '''growth inhibition disc tests (GI)'''. This is the simplest and most specific test, but the '''least sensitive''' of the tests available. It depends on the direct inhibition of mycoplasma growth on solid media by specific hyperimmune serum, and detects primary surface antigens.<ref>Dighero, M. W., Bradstreet, P. C. M., Andrews, B. E (1970) '''Dried paper discs for serological identification of human mycoplasmas'''. J Applied Bacteriology, 33:750-757</ref>

 

Definitive diagnosis can also be made by the isolation of'' M. capricolum ''subsp. ''capripneumoniae'' from clinical samples, usually lung tissue but may be a long and difficult process and requires attentive sampling techniques.

An '''in the field''' diagnostic procedure is the [[Agglutination|'''latex agglutination test (LAT)''']] which detects antibodies.<ref> Rurangirwa, F. R., McGuire, T. C., Kibor, A., Chema, S (1987) '''A latex agglutination test for field diagnosis of contagious caprine pleuropneumonia'''. Veterinary Record, 121(9):191-193; 11</ref> The sensitised latex beads are stable at 4°C, room temperature and 37°C for over one year. Thus the '''long shelf-life''' of the beads at different temperatures makes it possible to prepare large amounts which can be stored until used. The latex agglutination test is an '''excellent procedure for the diagnosis of CCPP and can be run in two minutes''' on samples of whole blood or serum, requires no sophisticated equipment or storage facilities and is adaptable to any laboratory or field conditions.  

 

The growth inhibition (GI) test is the simplest and most specific, but the least sensitive of the tests available.

Definite diagnosis is made by the '''isolation''' of ''M. capricolum ''subsp. ''capripneumoniae'' from clinical samples, usually '''lung tissue''' and may be a long and difficult process. The success of isolation depends primarily on the attention that is given to sample collection.

 

The direct and indirect [[Immunofluorescence|fluorescent antibody tests]] are among the most effective, simple and rapid serological methods of identification for most mycoplasmas.<ref>Rosendal, S., Black, F. T (1972) '''Direct and indirect immunofluorescence of unfixed and fixed mycoplasma colonies.''' ''Acta Pathologica et Microbiologica Scandinavica'', 80:615-622</ref>

The '''direct and indirect [[Immunofluorescence|fluorescent antibody tests]]''' are among the most '''effective, simple and rapid serological methods''' of identification for most Mycoplasma species.<ref> Rosendal, S., Black, F. T (1972) '''Direct and indirect immunofluorescence of unfixed and fixed mycoplasma colonies'''. Acta Pathologica et Microbiologica Scandinavica, 80:615-622.</ref> Several forms have been described, the most commonly used one is the  indirect fluorescent antibody (IFA) test which is applied to unfixed colonies on agar.

 

The [[Complement Fixation|complement fixation test (CFT)]] and the indirect haemagglutination test (IHA) are serological methods of diagnosis, as is the [[ELISA testing|ELISA]]. These have varying degrees of efficacy.

The [[Complement Fixation|complement fixation test (CFT)]] and the indirect haemagglutination test (IHA) are serological methods of diagnosis, as is the [[ELISA testing|ELISA]]. These have varying degrees of efficacy.

 

Diagnostic systems based on PCR have now been developed for the rapid detection, identification and differentiation of ''M. capricolum'' subsp. ''capripneumoniae.''

Diagnostic systems based on '''PCR''' have been developed for the rapid detection, identification and differentiation of members of the ''M. mycoides'' cluster and the specific identification of ''M. capricolum'' subsp. ''capripneumoniae''<ref>Bashiruddin, J. B., Taylor, T. K., Gould, A. R (1994) '''A PCR-based test for the specific identification of Mycoplasma mycoides subspecies mycoides SC'''. Journal of Veterinary Diagnostic Investigation, 6(4):428-434; 14</ref> <ref>Hotzel, H., Sachse, K., Pfützner, H (1996) '''A PCR scheme for differentiation of organisms belonging to the Mycoplasma mycoides cluster'''. Veterinary Microbiology, 49(1/2):31-43; 21</ref>

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The diagnosis of outbreaks of CCPP is often complicated by other infectious agents causing similar syndromes including other mycoplasmas and ''[[Pasteurella haemolytica]]''.

The diagnosis of outbreaks of CCPP is often complicated by other infectious agents causing similar syndromes including other mycoplasmas and ''[[Pasteurella haemolytica]]''.

== Treatment and Control ==

== Treatment and Control ==

The macrolides ('''erythromycin, spiramysin, and tylosin'''), '''tetracyclines and quinolones''' are active against ''M. capricolum'' subsp.'' capripneumoniae''.  

The macrolides ('''erythromycin, spiramysin, and tylosin'''), '''tetracyclines and quinolones''' are active against ''M. capricolum'' subsp.'' capripneumoniae''.  

 

Control measures include '''prevention of mixing and good hygiene'''.  

Control measures include '''prevention of mixing and good hygiene'''.  

Movement restrictions and slaughtering infected animals are recommended for countries that are newly infected.

Movement restrictions and slaughtering infected animals are recommended for countries that are newly infected.

{{Learning

{{Learning

|flashcards = [[Contagious Caprine Pleuropneumonia Flashcards]]

|flashcards = [[Contagious Caprine Pleuropneumonia Flashcards]]

}}

}}

== References ==

== References ==

Wesonga, H. O., Litamoi, J. K., Kagumba, M., Wakhusama, E (1993) '''Relationship between clinical signs and early lesions of contagious caprine pleuropneumonia caused by Mycoplasma strain F38'''. ''Small Ruminant Research,'' 10(1):45-54; 15  

Wesonga, H. O., Litamoi, J. K., Kagumba, M., Wakhusama, E (1993) '''Relationship between clinical signs and early lesions of contagious caprine pleuropneumonia caused by Mycoplasma strain F38'''. ''Small Ruminant Research,'' 10(1):45-54; 15  

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