Print version ISSN 0036-4665
Rev. Inst. Med. trop. S. Paulo vol.41 n.3 São Paulo May 1999
Mycobacterium tuberculosis was isolated from a central venous catheter in a non-immunosuppressed patient with systemic tuberculosis.
This case report represents a very uncommon form of isolation of Mycobacterium tuberculosis. A total improvement was obtained after treatment.
KEYWORDS: Mycobacterium tuberculosis ; Bacteremia; Sepsis; Blood.
A 45 year-old man, with fever, cough and weight loss (4 kg/30 days) was admitted to the hospital. The chest X-ray shows left pleural effusion, and infiltration on both lungs. The patient underwent a central venous catheterization and after the catheter removal Mycobacterium tuberculosis was identified from it at the microbiology laboratory. The anti-HIV test was negative.
The patient received antimycobacterial therapy for six months with total improvement.
The material obtained from the luminal side of the catheter was Gram-stained and a neutral gram bacilli were observed, suggesting mycobacteria. In the presence of acid fast bacilli by the Ziehl-Neelsen, the material was planted in Lowenstein-Jensen and 30 days after, a Mycobacterium spp was isolated. The germ was sent to the Reference Mycobacteriology Laboratory and was identified as Mycobacterium tuberculosis. Growth more than 7 days, non pigmented colonies, niacin positive, in Ogawa with drugs (PNB negative and TCH positive).
Despite their medical therapeutic qualities, catheters serve as a major focal point for infections, either as consequence of colonization of the canula wound or of the surface and/or luminal side of the catheter itself. In most instances the offending microorganisms have been species of Staphylococcus, Streptococcus, gram-negative bacilli, Corynebacterium, and Candida5,7.
The recognition of nontuberculous mycobacteria, especially Mycobacterium chelonae, as cause of infection in the setting of long-term indwelling intravascular catheters has only recently gained the appreciation of clinicians and microbiologists1,2,4.
In the present report, we describe a patient with pleural and pulmonary tuberculosis who developed a central venous catheter-associated bacteremia caused by M. tuberculosis.
The M. chelonae is now being increasingly recognized as the cause of catheter-related infections, specially in patients with cancer1,4. They can cause exit site infections, tunnel infections or catheter associated bacteremia with disseminated disease. These rapidly growing mycobacteria are ubiquitous in nature, found in soil, water and dust. They also have been isolated from the respiratory and gastrointestinal tracts of humans without evidence of disease. On the Gram-stained smear they appear to be Gram-positive bacilli and are often mistaken by Corynebacterium species6.
The report of a M. tuberculosis catheter associated infection seems to be very unusual, and it was possible to detect this germ, in this report, because of the meticulous routine done during the processment of the specimen. It was crucial to detect the organisms. The microscopy was very helpful to indicate the presence of the M. tuberculosis on the catheter because of the Gram-stain neutrality5. The presence of Gram neutral bacilli on the smear was fundamental to the decision to plant the specimen on Lowenstein-Jensen.
Um caso de bacteremia associada a cateter vascular causada por Mycobacterium tuberculosis em paciente não imunossuprimido
Relatamos um caso de isolamento de Mycobacterium tuberculosis de cateter venoso central. O paciente apresentava tuberculose miliar e nenhum sinal de imunossupressão. O tratamento com tuberculostáticos foi efetivo.
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(1) Laboratório de Microbiologia Clínica, Instituto Especializado em Pesquisa e Diagnóstico (IPD), Santa Casa, Porto Alegre, RS, Brasil.
(2) Pavilhão Pereira Filho, Santa Casa, Porto Alegre, RS, Brasil.
(3) Laboratório Central da Fundação Estadual de Produção e Pesquisa em Saúde, Secretaria de Saúde e Meio Ambiente do Estado do Rio Grande do Sul, Porto Alegre, RS, Brasil.
Correspondence to: V.F. Petrillo, IPD - Santa Casa, Annes Dias 285, 90020-090 Porto Alegre, RS, Brasil. Fax 051 214 8435; e-mail: firstname.lastname@example.org
Received: 09 June 1998
Accepted: 06 April 1999