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Case Report |
First Propedeutic Medical Department1 , Department of Radiology2 , First Department of Microbiology3 and Department of Cardiology4 , AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
Correspondence
Konstantina Tzavella
ktzavell{at}med.auth.gr
Received 19 September 2005
Accepted 29 October 2005
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Case report |
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Initial laboratory tests showed elevated levels of C-reactive protein, up to 8·5 mg dl–1 (normal range <0·8 mg dl–1), and procalcitonin, up to 1·6 ng dl–1 (normal range <0·5 ng dl–1), accelerated erythrocyte sedimentation rate (70 mm h–1), thrombocytopenia (70 000 platelets µl–1) with normal white blood cell count and haemoglobin, impaired renal function (1·9 mg creatinine dl–1, normal range 0·5–1·4 mg dl–1; 101 mg serum urea dl–1, normal range 10–50 mg dl–1), elevated lactate dehydrogenase (1016 U l–1, normal range 240–480 U l–1), 
-glutamyl transpeptidase (183 U l–1, normal range 8–65 U l–1), alanine aminotransferase (172 U l–1, normal range <38 U l–1), aspartate aminotransferase (205 U l–1, normal range <41 U l–1) and alkaline phosphatase (509 U l–1, normal range 40–129 U l–1). Blood-gas analysis revealed hypoxaemia (pO2 60 mm Hg, pCO2 35 mm Hg, pH 7·4). The cerebrospinal fluid showed a slight pleocytosis (12 cells mm–3, 90 % polymorphonuclear) and an increased level of protein (53 mg dl–1). A CT (computed tomography) scan and ultrasound of the abdomen showed mild enlargement of liver and spleen without lymphadenopathy. Chest X-ray, CT scan and magnetic resonance imaging of the head, as well as an encephalogram, were normal.
The patient remained haemodynamically stable, but deteriorated neurologically within the first 24 h after admission, in spite of additional intravenous therapy with dexamethasone and mannitol. Due to clinical findings (diffuse macupapular rash, fever, headache, myalgia, inoculation eschar) and laboratory findings (thrombocytopenia, elevated alanine and aspartate aminotransferase) a rickettsial infection was suggested, so antibiotic therapy with doxycycline (200 mg per day, orally) was started on the eighth day after disease onset. Only 24 h later a remarkable improvement was seen in the patient's neurological symptoms and the pathological laboratory findings. The rash temporarily worsened and became petechial, but disappeared approximately 7 days later.
At 12 days after disease onset an indirect immunofluorescent antibody test revealed elevated IgM and IgG titres to Rickettsia conorii (1 : 512 and 1 : 64, respectively) with rising titres, up to 1 : 2048 and 1 : 1024, respectively, 2 weeks later. No other source of infection was found. There was no growth on routine microbiological culture of blood, urine and cerebrospinal fluid; typhoid fever, endemic typhus and toxoplasmosis were ruled out.
The patient was discharged 14 days after admission, receiving doxycycline for a total of 15 days. He also remained asymptomatic without any pathological laboratory findings at control examinations 6 and 9 weeks later. There was a further increase of IgG titres against R. conorii (>1 : 2056), while the IgM titre declined continuously (final titre < 1 : 64).
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Discussion |
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MSF is significantly seasonal, with most cases appearing during spring and summer months (Raoult & Roux, 1997; Alexiou-Daniel et al., 2003). Seroepidemical investigations showed a high seroprevalence of R. conorii among the healthy Greek population (Daniel et al., 2002); however, only few cases of MSF have recently been reported (Alexiou-Daniel et al., 2003; Spengos et al., 2005).
In this report we presented a severe case of MSF with predominantly neurological features. The infection developed in July and the patient was living in an urban area of northern Greece without contact with domestic dogs. The severity of the illness was probably due to the delayed initiation of the appropriate antibiotic therapy with doxycycline. Our patient developed the symptoms gradually during the first week of the disease, so that he was treated for each one (e.g. chest pain, a possible initial symptom of myalgia, fever, rash) separately, while the underlying disease remained unrecognized. The initial flu-like symptoms of MSF may confuse physicians, and the common practice of prescribing ß-lactams as empirical therapy may contribute to a delay in the diagnosis of boutonneuse fever and result in life-threatening complications or permanent disabilities in some infected individuals (Jensenius et al., 2004). Early recognition of the disease and immediate administration of the appropriate antibiotic therapy is essential for rapid recovery and prevention of complications, but confirmation of diagnosis during the acute phase is difficult. For this reason, diagnosis of the disease should initially be based on epidemiologic criteria as well as on clinical findings and laboratory findings (e.g. thrombocytopenia, elevated alanine and aspartate aminotransferase), according to the diagnostic criteria described by Brouqui et al. (2004).
The diagnosis of boutonneuse fever is usually confirmed by serological testing using an immunofluorescence assay, the reference technique in most laboratories, to detect IgM and IgG antibodies against R. conorii in acute and convalescent sera (La Scola & Raoult, 1997; Brouqui et al., 2004). Detection of both antibodies can usually be made 7–15 days after disease onset, and therefore provides a retrospective diagnosis. In our case IgM and IgG antibodies against R. conorii were detected during the second week of the illness, showing a titre increase in excess of fourfold 2 weeks later.
Despite the delayed beginning, our patient recovered promptly after administration of doxycycline, currently the standard therapeutic regimen for MSF (Jensenius et al., 2004).
In conclusion, due to the high seroprevalence of R. conorii in Greece we believe that MSF has been underrecognized and underreported so far, and may occur as a severe illness in our country. Not only domestic, but also foreign, physicians should be aware and remember the possibility of the disease for all febrile patients living in or recently travelling from a tick-infected area in Greece, even in the absence of an inoculation eschar and skin rash.
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