A doença Estreptococose é muito frequente nos pombos. É causada pela bactéria Streptococcus Gallolyticus e é parecida com a Paratifose ( Mal da Asa) e com a Clamídia, algumas das doenças bacterianas mais frequentes em pombos.

Muitas vezes os columbófilos confundem o Estreptococos com a Paratifose, resultando muitas vezes num tratamento errado.

Em pombos saudáveis a bactéria Streptococcus Gallolyticus pode aparecer nos intestinos sem causar doença no pombo. Só quando a bactéria atravessa a barreira sanguínia intestinal, por outras palavras, entra no sistema de circulação sanguínia, é que aparecem os sintomas mais graves.

Um exemplo típico é a morte súbita de um pombo, que algumas horas antes, parecia completamente saudável. Isto é devido ao facto de as bactérias, uma vez no sangue, podem rapidamente causar inflamações graves em orgãos e musculos.

Em laboratorio, procedeu-se a infecção experimental de pombos saudáveis, processo através do qual, a bactéria foi directamente injectada no sangue, todos os pombos morreram poucas horas depois de serem injectados. O tratamento antimicrobiano, logo após a contaminação não salvou os pombos da morte.

Com contaminações ligeiras, os principais sintomas são dificuldade em voar ( causada por reacções à inflamação nos músculos e tendões),mal-estar geral, fezes viscosas e perda de apetite.

Nota: Muitos columbofilos queixam-se de inicio de campanha que aparecem pombos a puxar das asas, a voar com muita dificuldade, a pousarem com frequencia e muitas vezes em pleno voo caem a pique no chão porque uma asas deixou de funcionar, segundo alguns especialistas isso deve-se a bacteria Streptococcus.

Às  vezes o único sintoma é a morte de um ou mais pombos, embora os outros estejam completamente saudáveis. Não se sabe quais os factores responsáveis pela entrada das bacterias no sangue. De um lado há a elevada carga de infecção nas imediações e factores de stress (ex. inicio dos voos, encestamentos frequentes, mudanças de alimentação), infecção intestinal, etc.

O Stress é um factor a ter em consideração para o aparecimento deste problema.

A Estreptococose também tem um factor Epidemiológico, múltiplos pombos da colónia mostram sintomas ao mesmo tempo.

Isto sugere o grau de infecção e devemos ter em consideração também os factores que causam a contaminação, assim como a estirpe especifica de bacterias ( tipo de Estreptococo).

O diagnóstico exacto só pode ser dado através da autópsia a uma pombo doente ou morto.

É por isso recomendado que todos os pombos sejam tratados, mesmo que, apenas alguns pombos mostrem sinais de estarem contaminados.

Apesar de a autópsia ser o meio mais exacto de diagnóstico, o mesmo pode ser feito, com base na observação dos sintomas.

Este diagnostico provável, é o mais comum em Portugal, visto que não temos uma estrutura Veterinaria vocacionada para o atendimento ao Pombo Correio.

A duração total do tratamento deve ser respeitada na integra ( 10 dias), mesmo que ao fim de 2 dias após o inicio do tratamento os pombos possam denotar melhorias ou simplesmente os sintomas tenham desaparecido.

O tratamento:

Consiste na aplicação de Ampicilina. Ampicillin-T da Chevita  individualmente ou na água de bebida durante 10 dias.

O tratamento funciona muito bem e os problemas com os pombos afectados são normalmente logo resolvidos.

Mesmo que o que vou escrever, nunca tenha sido cientificamente provado, segundo opinião do Dr. Ruben Lanckriet ( 25-02-2010), pelas sua experiencia adquirida pelos inumeros casos que recorrem ao seu consultorio para consulta veterinaria e respectiva resolução, os casos de Estreptococose, surgem com mais frequencia em colonias que tenham tido no passado problemas com Salmonelas/Paratifose.

Uma das explicações para isso, são os danos que a salmonela provoca nas paredes do intestino, proporcionando assim que o estreptococo seja facilmente tranferido para a corrente sanguínia.

Quando a doença ocorre durante a campanhã desportiva, pode ser a causa da perca de muitos bons pombos e das más prestações desportivas.

O columbofilo deve estar muito atento, porque numa prova pode perder pombos sem razão aparente, quando a mesma foi normal para os outros columbofilos do mesmo clube.

Estas percas devem-se à dor que a inflamação provoca nos musculos e tendões dos pombos.

Às vezes até mesmo grandes pedaços de musculo são perdidos devido a forte inflamação e são substituidos por tecido conjuntivo ( necrose muscular). Compete ao columbofilo detectar a tempo e prevenir esta terrível necrose muscular. Caso o faça é provavel que consiga bons resultados com esses mesmos pombos após o tratamento.

Os estudos indicam que o Improver e o Anti-Fungal ajudam na prevenção deste tipo de doença.

Os Antibioticos indicados são a Ampicilina e a Doxyciclina.

A Erytromicina actua só em 70 % dos casos.

Os pombos só reagem em 30 % ao Baytril no caso de Estreptococos. Portanto isto explica os n comentarios: É pá dei Baytril aos pombos e continuam a puxar das asas.

Meus amigos, não é normal uma loja que eu conheço ter vendido numa semana 50 frascos de Baytril. Isto esta tudo maluco....Baytril é o antibiotico mais forte que existe, já não se descobre antibioticos desde 1983. Se as bacterias ganharem resistencia ao Baytril vão dar o que a seguir ?????????

Utilizem a Ampicilina, Doxyciclina da Chevita por exemplo...são formuladas e adaptadas para pombos. Existe gente a queimar pestanas e a fazer estudos e ensaios em laboratorio para doenças especificas dos pombos. Parem de inventar tratamentos a sorte e recorram a veterinarios.

Existem outros compostos a base Amoxicilina que funcionam muito bem também...

Artigo mais completo em Inglês.

Streptococcus is the name given to a group of dot-shaped bacteria that are capable of causing disease in pigeons. They are everywhere in the environment, mainly in the dust and air. Many species have been isolated from pigeons and they are considered part of the normal bacteria found on the skin and the lining of the digestive, respiratory and reproductive tracts. There are different types of Streptococcus that vary in their ability to cause disease. Transition from a normal bacterial inhabitant to a disease agent depends on how effectively the pigeons’ immune system is operating.

Experimentally, researchers have deliberately infected pigeons with disease-causing strains of Streptococci, both by intravenous injection and by mouth. Many of those infected by the intravenous route became sick, developing a variety of symptoms. Interestingly however, in the pigeons inoculated with the organism by mouth, none became sick, although the organism could be cultured from the droppings or mouth of at least half of the pigeons in the month following infection. This experiment helps to explain the nature of the disease process with Streptococcus.

Pigeons are obviously being exposed to the organism intermittently but when an otherwise healthy pigeon ingests the organism, disease is unlikely to occur. Once the organism, however, gains entry to the blood stream, the pigeon can become unwell. In some studies, potentially harmful species of streptococci have been recovered from the intestines from up to 40% of healthy pigeon s. Many pigeon s obviously carry these organisms without becoming sick.

As with other diseases in pigeons, there needs to be a trigger factor that enables the organism to invade the blood stream and spread throughout the body. This trigger is essentially any factor that runs the pigeon down. Predisposing factors include poor management, poor loft environment and concurrent disease, but also the ability of the type of Streptococcus itself to cause disease.

Signs Associated with Disease

Once the bacteria have invaded the body of a vulnerable bird, it can spread to a variety of sites. This, together with the fact that the severity of the disease can vary, leads to a wide variety of symptoms that often mimic other diseases. It is therefore important that pigeon fanciers do not jump to a premature conclusion that this is the problem with any unwell pigeons they may have.

Once the organism invades from the bowel or skin, etc, into the blood stream, it can be carried to a wide variety of sites. The symptoms displayed by the pigeons depend on the actual site within the body that the bacteria infect and also the severity of the infection. Disease displayed by the pigeons can be per acute or chronic. Some pigeons develop a severe overwhelming disease and will die so quickly that they do not have time to lose condition.

These pigeons become quiet, fluffed up and die within 2 - 3 days. Other pigeons develop a chronic ill-thrift type condition that may persist for as long as 6 - 8 weeks. Some of these pigeons with treatment will recover, while others will eventually die. In some apparently recovered pigeons, relapses can occur. In still other pigeons, the disease may be transient and mild.

In some infected pigeons, the organism will localize in the respiratory system, leading to red watery eyes, a nasal discharge and difficulty breathing. In other pigeons, the liver can be affected, leading to a green diarrhea and weight loss. In some pigeons, the heart itself may become infected. If these pigeons survive, they may develop long-term heart problems, leading to a chronic shortage of breath.

The organism can also infect the membrane around the brain (leading to poor coordination, loss of balance, or a head tilt), the muscles (leading to bleeding and inflammation), the joints (leading to swollen red painful joints, in particular in the wings and legs), the kidney (leading to a thirst and excessive urination), the bowel (leading to diarrhea), the abdomen (leading to fluid accumulation and a swollen abdomen) and testicles (leading to premature infertility in young cocks). Notably, the organism can also infect the ovary and fallopian tube of hens.

This can lead to interference with ovulation, meaning that some hens will become sterile or lay eggs late or irregularly. In those that do lay, the organism can be incorporated in the egg at the time of its formation, leading to embryonic death during incubation or a weakened chick that dies during hatching or shortly after. Because the organism is found in pigeons droppings, it can contaminate the nest box and infect the healing navel of recent hatchlings.

Because of the wide variety of symptoms associated with the disease, the disease cannot be diagnosed by the signs displayed by the pigeons. Similarly, the disease cannot be diagnosed through examination of the droppings as it is found there normally in many pigeon s and most of these will be quite healthy. The only way to diagnose the disease is by culturing the organism from certain organs during autopsy. Swabs for culture are usually taken from the heart, brain, liver or a visible lesion.

Treatment and Control

As always, good ongoing care and preventive treatment all year long to avoid bad bacterias incubation by the pigeons will mean that most pigeons are able to resist the disease and those that do get sick are in the best situation to recover. When Streptococcal disease is diagnosed, it is vital for the pigeon fancier to identify and correct the flaw in his management or loft environment that has enabled the disease to flare up in the first place. Otherwise, a poor response to any medication can be anticipated.

Being a bacterial infection, the organism responds to Improver, Antifungal or an antibiotic treatment. And so, what are the best antibiotics to use? The best way to treat is to have your veterinarian culture the Streptococcal organism involved in your outbreak and also have him do what is called a sensitivity test in order to ascertain what is the most effective antibiotic for that particular strain of Streptococcus.

Studies do, however, show that 80% of organisms are controlled by the natural products Improver and AntiFungal, as well the antibiotics ampicillin (a synthetic penicillin) and Doxycycline, while 70% are sensitive to Erythromycin, 30% are sensitive to enrofloxacin (Baytril) and only 10% are sensitive to sulfur-based antibiotics. Obviously, the two poorest drugs are Baytril and the sulfur-based antibiotics, so they are not likely to be the first choice for treatment of this disease (although obviously they are useful in other situations). In the absence of testing, doxycycline is the usual choice as it is equally effective as the synthetic penicillins but is more economical.

As with other bacterial bowel diseases, Improver, AntiFungal and probiotics have a significant role to play in the control of Streptococcal infections. They can be used in times of stress when the normal bowel bacteria are disrupted to minimize the risk of Streptococcal invasion and also to preventatively treat healthy pigeons that have been in contact with pigeons infected with Streptococcus. Interestingly, exhibitors of fancy breeds have noticed how Streptococcal diarrhea can be avoided in pigeons taken to shows if the pigeons are treated with probiotics, eg Probac, for several days before and after the show.

Maintenance of a clean, dry loft will minimize exposure to the organism. If necessary the loft can be disinfected. Streptococci are sensitive to most of the commonly used disinfectants.When Streptococcal infection occurs in an loft, it will spread slowly through the flock and some pigeons will start to die. When testing by your veterinarian confirms the disease, the following protocol can be followed:

Loft cleaned and disinfected.
Trigger factors such as overcrowding, poor diet, low hygiene, inadequate parasite control, cold or damp conditions etc, are identified and corrected.

Unwell pigeons are separated and either treated with double dosage of Improver and AntiFungal or Doxycycline tablets, or culled.