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Rev. Soc. Bras. Med. Trop. vol.35 no.5 Uberaba Sept./Oct. 2002
RELATO DE CASO
Febre maculosa brasileira: descrição de um caso fatal no estado do Rio de Janeiro
Abstract We describe a case of Brazilian spotted fever in a previously healthy young woman who died with petechial rash associated to acute renal and respiratory insufficiency 12 days following fever, headache, myalgia, and diarrhea. Serologic test in a serum sample, using an immunofluorescence assay, revealed reactive IgM/IgG.
Key-words: Spotted fever. Fatal case. Rio de Janeiro. Brazil.
Resumo Descreve-se um caso de febre maculosa brasileira numa paciente adulta, previamente saudável, que evoluiu para o óbito apresentando um quadro de exantema petequial associado à insuficiência respiratória e renal após 12 dias de doença caracterizada por febre, cefaléia, mialgia e diarréia. Teste de imunofluorescência indireta realizado em amostra de sangue foi reativo para IgM e IgG anti-Rickettsia rickettsii.
Palavras-chaves: Febre maculosa. Caso fatal. Rio de Janeiro. Brazil.
Brazilian spotted fever (BSF), which is caused by tick-borne Rickettsia ricketsii, is the most important and frequently reported rickettsial disease in Brazil2 8 9 11 14. Amblyomma cajennense, distributed throughout Brazil, is the most important tick-vector1 10 12 15 16. As with Rocky Mountain spotted fever (RMSF) in North America, BSF has a rapid course, a great potential to cause death, and presents nonspecific clinical manifestations, mainly in the early stages, which resemble other infectious and noninfectious diseases1 2 5 8 9. The initial manifestation is usually a flu-like syndrome characterized by a sudden onset of fever, malaise, myalgia, headache, associated with rash, which may be macular, maculopapular, petechiae, ecchymotic or purpuric, depending on the phase of the illness1 2 3 5 8 17. In the majority of cases, complications and fatality are associated with misdiagnosis as well as delayed diagnosis and/or treatment3 5 8 14.
This report summarizes the clinical course of BSF in a 29 year-old woman residing in the Municipality of Nova Iguaçu, State of Rio de Janeiro that died after initial diagnosis of leptospirosis.
On July 17, 2001, a woman aged 29 years was referred to a physician with a 7-day history of fever, severe headache, myalgia and diarrhea. The patient was admitted to a public hospital with a diagnosis of leptospirosis and was immediately started on intravenous penicillin.
The epidemiologic investigation revealed that the patient lived in a semi-rural region and had contact with domestic animals and rodents.
In the clinical examination, the patient had an axillary temperature of 40oC, a rash in the lower extremities, heart rate of 124 beats/minute and a blood pressure of 95X60mmHg, with respiratory and abdominal examination without abnormalities.
The hemoglobin was 10.7g/dl, hematocrit was 28%, white blood cell count was 5,410 leukocytes per cubic millimeter (27% band forms, 50% neutrophils, 6% lymphocytes, 13% monocytes), and the platelet count was 20,600 per cubic millimeter. The serum glucose was 119mg%, creatinine 5.6mg%, aspartate aminotransferase (AST) 289U/l, alanine aminotransferase (ALT) 426U/l and elevation of direct bilirubin 3.3mg%. Serologic test for leptospirosis (macroagglutination) was positive. The chest X-ray was normal.
Shortly after admission, the symptoms worsened, the patient developed disorientation, dehydration, seizures and respiratory distress, following which she was transferred to the intensive care unit.
On July 20, the patient, under mechanical ventilation and hemodialysis, developed a diffuse maculopapular rash with petechiae, when therapy with intravenous chloramphenicol for possible BSF was initiated. Laboratory findings, showed a white blood cell count of 18,900 (19% band forms, 65% neutrophils, 10% lymphocytes, 4% monocytes). Analysis of the cerebrospinal fluid was normal. Serological tests for leptospirosis (microagglutination), dengue (enzyme-linked immunosorbent assay /MACELISA), Ehrlichia (indirect immunofluorescence assay - IFA), viral hepatitis (ELISA) were all negative.
On July 23, the patient subsequently developed upper gastrointestinal bleeding and died. Serologic test for BSF, using an IFA, in serum samples collected on the 20th and 23rd July, revealed negative IgM/IgG and reactive IgM(1:8)/ IgG(1:64), respectively.
BSF had been identified in Brazil since the late 1890s, but the first cases were reported in 19311. Although BSF is not a nationally notifiable disease, the majority of confirmed cases are reported in the states of the Southeastern region (Espírito Santo, Minas Gerais, Rio de Janeiro and São Paulo). Since the 1970's, several confirmed and suspected cases have been reported in the State of Rio de Janeiro, including the region of Nova Iguaçu, where this fatal case occurred2 6 7 8 9 10 11 12 14.
The clinical characteristics of BSF seen in this case did not differ from those described in other parts of Brazil or in other countries within the American continent. Since only 3-18% of the patients present with rash, fever, headache and a history of tick bite, its diagnosis can be difficult1 2 8 14, especially during the first days of illness, when the clinical manifestations can suggest leptospirosis, dengue, viral hepatitis, salmonellosis or encephalitis. With development of rash, meningococcemia, measles, rubella, enteroviral infection, infectious mononucleosis, staphylococcal septicemia, gram-negative sepsis, drug eruption, systemic lupus erythematosus, among other diseases, may be confused with BSF2 3 5 8 9 13 14.
Laboratory abnormalities such as thrombocytopenia, anemia, hyponatremia, pre-renal azotemia, as well as nonspecific elevations of enzymes such as alkaline phosphatase, and aspartate transaminase can help to recognize BSF2 3 8 10 11 14.
Complications, notably renal failure, seizure, secondary infections, coma and consequent high mortality rate are associated with misdiagnosis, delayed diagnosis and/or treatment. Several studies show that late initiation of specific antirickettsial therapy (after five days of illness) is associated with substantially greater risk for a fatal outcome3 5. Thus, the treatment must be started on an empiric basis, before results are available from the serologic specimens, because the changes in the diagnostic titers usually occur suddenly and only after 7-10 days of illness (IFA)17.
R. rickettsii is susceptible to antimicrobial agents, such as chloramphenicol, and tetracycline4 5. Although ciprofloxacin and ofloxacin also present in vitro activity against R. rickettsii, data are insufficient for use of these drugs in the treatment of BSF. Most antibiotics, such as penicillin, cephalosporin, aminoglycosides, erythromycin, and trimethoprim-sulfamethoxazole are ineffective for rickettsia18 19.
Prevention of BSF can be acheived by avoiding exposure to ticks, mainly during June-October; by inspecting the body, head and clothes for ticks and removing the attached ticks after time spent in wooded or grassy areas or after contact with animals.
As BSF continues to be a potentially lethal threat, any individual with fever, malaise, and other infectious manifestations who has been in a BSF-endemic area or has been bitten by ticks and/or had contact with animals, must receive empiric antimicrobial therapy without waiting for development of the rash or serologic result, mainly during the period between June and October. Thus, a prompt anti-rickettsia therapy within the first days of onset of illness should contribute to reduce the high mortality rates that have been observed on reported spotted fever cases in Brazil.
Finally, during analysis of this fatal case we were informed that since January, 2001, in the Grama/Miguel Couto (region of the municipality of Nova Iguaçu), a further nine fatal cases have occurred without confirmed diagnosis. Could these be due to BSF? Preliminary analysis of the evaluation, by using IFA, of the serum samples stored in the Brazilian National Reference Center for Leptospirosis/FIOCRUZ from a total of 234 inhabitants from this region showed two samples reactive with low antibody titers to R. rickettsii. More information will be reported after studies that we will develop in this region.
The authors wish to thank Dr. Martha Maria Pereira for providing serum samples from Brazilian National Reference Center for Leptospirosis (FIOCRUZ) and Dr. James Olson (CDC) for providing the antigen used in this study.
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1. Departamento de Virologia do Instituto Oswaldo Cruz da Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brasil. 2. Hospital Geral de Nova Iguaçu, Rio de Janeiro, Brasil.
Address to: Drª Elba R.S. Lemos. Dept° de Virologia/IOC/FIOCRUZ. Av. Brasil 4365, Manguinhos, 21045-900 Rio de Janeiro, RJ, Brazil.
Fax: 55 21 2270- 6397
Recebido para publicação em 11/03/2002