Presentación faríngea de la sífilis secundaria: a propósito de un caso / Pharyngeal presentation of secondary syphilis: a case report

RESUMEN La sífilis es una infección de transmisión sexual causada por la bacteria Treponema pallidum. En los últimos años ha habido un aumento en la incidencia de esta enfermedad debido a la creciente infección por el virus de la inmunodeficiencia humana (VIH) e inmunodepresión. Conocida como "la gran imitadora" son muchos los signos y síntomas que puede simular, siendo la presentación orofaríngea infrecuente. Presentamos el caso de un varón de 31 años de edad que acude a nuestro servicio por clínica de otitis media serosa bilateral. En la exploración física se objetiva una masa en cavum y una ulceración en pared faríngea posterior que se biopsia en consultas externas siendo el resultado un intenso infiltrado inflamatorio crónico de probable origen infeccioso, por lo que se decidió tomar una nueva biopsia bajo anestesia general. El día de la intervención, el paciente refirió la aparición de un exantema eritematoso generalizado, pero de predominio palmo-plantar. Interrogado sobre sus antecedentes, el paciente reconoció conductas sexuales de riesgo y ser portador VIH, por lo que se orientó el diagnóstico hacia una probable sífilis secundaria que se confirmó posteriormente mediante serología. Las lesiones de orofaringe, la masa del cavum y el exantema remitieron con tratamiento antibiótico y corticoideo pautado. Cuando las manifestaciones de cabeza y cuello constituyen la presentación inicial de la sífilis, su diagnóstico se retrasa con frecuencia debido al desconocimiento por parte del médico de primaria, e incluso del otorrinolaringólogo, de las formas típicas de presentación en esta localización. Su diagnóstico precoz es fundamental para prevenir la extensión de la enfermedad.

ABSTRACT Syphilis is a sexually transmitted infection caused by the bacteria Treponema pallidum. Over the last years there has been an increase of the incidence of this disease due to the growing infection by the human inmunodeficiency virus (HIV) and the inmunosupression. Known as "the great imitator", there are many signs and symptoms that can simulate, being the oropharyngeal presentation infrequent. We present the case of a 31-year-old man who came to our service for bilateral otitis media. Physical examination revealed a mass in the cavum and ulceration in the posterior pharyngeal wall that was biopsied in the outpatient clinic. The result was an intense chronic inflammatory infiltrate of probable infectious origin, so it was decided to take a new biopsy under general anesthesia. On the day of the intervention, the patient reported the appearance of a generalized erythematous rash, but predominantly on the bottoms of the feet and on the palms of the hands. Questioned about his background, the patient recognized risky sexual behavior and being an HIV carrier, so the diagnosis was oriented towards a probable secondary syphilis that was subsequently confirmed by serology. The ulcerations of the oropharynx, the mass of the cavum and the rash subsided with antibiotic treatment and corticoid regimen. When the manifestations of the head and neck are the initial presentation of syphilis, its diagnosis is often delayed due to the lack of knowledge of the physicians of the typical presentation forms in this location. Early diagnosis is essential to prevent the spread of the disease and its complications.

First detection of plasmid-encoded blaOXY beta-lactamase.

Three Klebsiella oxytoca isolates and one Klebsiella pneumoniae isolate from three children admitted to the Hematology Unit of Hospital Vall d'Hebron (Barcelona, Spain) exhibited a susceptibility pattern suggesting OXY beta-lactamase hyperproduction. All the isolates contained a 95-kb plasmid that harbored bla(OXY-1), which was transferred by electrotransformation but could not be self-transferred by conjugation. A qnrS1 gene was also harbored in the bla(OXY-1)-carrying plasmid. This is the first report of a plasmid-encoded OXY beta-lactamase.

Dissemination of extended-spectrum beta-lactamase-producing bacteria: the food-borne outbreak lesson.

OBJECTIVES: Commensal and opportunistic bacteria producing extended-spectrum beta-lactamases (ESBL-PB) have undergone a broad and rapid spread within the general population; however, the routes of dissemination have not been totally elucidated. The aim of this study was to determine whether individuals involved in an outbreak of acute gastroenteritis, in addition to the enteropathogenic microorganism, share an ESBL-PB as indirect demonstration of its transmission from a common food source. METHODS: From 2003 to 2004 in Barcelona, Spain, stool samples from 905 people involved in 132 acute gastroenteritis outbreaks and 226 food handlers related to the outbreaks were investigated. RESULTS: In 31 outbreaks, 58 diners carrying one or more ESBL-PB were detected. In 10 outbreaks, two or more diners shared the same ESBL-PB, and in four of them, the strain was shared with the food handlers. CONCLUSIONS: This study provides circumstantial evidence that foods can be a transmission vector for ESBL-PB, probably from two reservoirs, food animals and food handlers.

Prevalence of qnr genes among extended-spectrum beta-lactamase-producing enterobacterial isolates in Barcelona, Spain.

OBJECTIVES: To evaluate the presence of qnr genes among enterobacterial isolates carrying extended-spectrum beta-lactamases (ESBLs) in Barcelona, Spain. METHODS: Screening for the qnrA, qnrB and qnrS genes was carried out by PCR amplification with specific primers in 305 non-duplicate, clinically relevant ESBL-producing enterobacterial isolates obtained from February 2003 to August 2004. ESBLs from all qnr-positive isolates were characterized by isoelectric focusing, PCR amplification and DNA sequencing. Plasmid analysis was performed by S1 digestion and hybridization with specific probes for the qnr and bla genes. Plasmids containing qnr genes were transferred by conjugation or transformation. The genetic environment of qnrA1 in selected isolates was characterized by cloning experiments. RESULTS: Fifteen isolates, each from a different individual, carried qnr. Among them, 14 had qnrA1 (6 Klebsiella pneumoniae, 6 Enterobacter cloacae and 2 Escherichia coli isolates) and 1 had qnrS1 (K. pneumoniae). None of the isolates carried qnrB. Among the qnrA1-carrying isolates, 10 possessed both bla(CTX-M-9) and bla(SHV-12), 2 had both bla(CTX-M-9) and bla(SHV-92) and 2 had bla(CTX-M-9) alone. The isolate with qnrS1 possessed bla(SHV-12). The qnrA1 and ESBL genes were located together on plasmids ranging in size from 40 to 320 kb. qnrS1 and bla(SHV-12) were not located on the same plasmid. Transfer of quinolone resistance was successfully achieved from all but three isolates. The cloned region surrounding qnrA in two K. pneumoniae isolates revealed a novel genetic organization. CONCLUSIONS: The prevalence of qnr among enterobacterial clinical isolates carrying ESBLs between 2003 and 2004 in Barcelona was 4.9%. qnrA1 was the most prevalent, whereas only one qnrS and no qnrB were detected.

In vivo reversion to the wild-type beta-lactam resistance phenotype mediated by a plasmid carrying ampR and qnrA1 in Enterobacter cloacae.

Resistance to beta-lactams and quinolones in two isogenic Enterobacter cloacae isolates was studied. One was susceptible to cefoxitin and amoxicillin-clavulanate. The other one showed its natural beta-lactam resistance pattern. Both isolates had a nonfunctional AmpR regulator. However, within the second one, the presence of a plasmid carrying ampR and qnrA1 allowed reversion to the wild-type beta-lactam resistance phenotype and decreased susceptibility to fluoroquinolones.

Measurement of gap junctional communication by fluorescence activated cell sorting.

Cell-to-cell communication via gap junctions has played a fundamental role in the orderly development of multicellular organisms. Current methods for measuring this function apply mostly to homotypic cell populations. The newly introduced Fluorescence Activated Cell Sorting (FACS) method, albeit with some limitations, is simple, reliable, and quantitative in measuring the dye transfer via gap junctions in both homotypic and heterotypic cell populations. In the homotypic setting, the result in dye transfer from the FACS method is comparable to the scrape-loading and microinjection methods. Using this FACS method, we observed a decline of cell-to-cell communication in transformed and cancer cells. We also observed a differential degree of communication between two heterotypic cell populations depending on the direction of dye transfer.