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INTRODUCTION Actually, there are more than 200 different causes of unknown fever, it is necessary for the doctor to identify the most prevalent causes of unknown fever in our Clinical boar. PRESENTATION A 52-year-old male patient with no history of chronic diseases, which was received in the Emergency Service of the Hospital San Pablo, Coquimbo, on 02/03/20 began a clinical picture characterized by fever up to 39 ºC associated with diaphoresis, evaluated several times in primary health care without response to symptomatic treatment. He denies dyspnea, cough, sputum production, headache, muscle weakness, myalgia, fainting, decreased visual acuity, nausea, vomiting, chest pain, abdominal pain, diarrhea, constipation, altered bowel movements, weight loss, dysuria, bladder tenesmus, pain lumbar, skin lesions. As relevant information, the patient reports having taken amoxicillin/clavulanate for 2 days on his own account. DISCUSSION Physicians should be aware of the rare extent of an unusual presentation of knowledge origin fever, probably associated with Still disease, as well as medical options for treatment. The literature does not conclude on a gold standard for the method of approach. CONCLUSION In our case, the etiological agent that could cause Fever of unknown origin (FUO) was Sars cov-2 given the presence of elevated inflammatory factors and acute phase proteins and the presence of neutrophilic infiltration

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BACKGROUND: Our purpose was to provide a detailed clinical description, of symptoms and laboratory abnormalities, and temporality in patients with confirmed Zika and dengue infections, and other acute illnesses of unidentified origin (AIUO). METHODS/ PRINCIPAL FINDINGS: This was a two-year, multicenter, observational, prospective, cohort study. We collected data from patients meeting the Pan American Health Organization's modified case-definition criteria for probable Zika infection. We identified Zika, dengue chikungunya by RT-PCR in serum and urine. We compared characteristics between patients with confirmed Zika and dengue infections, Zika and AIUO, and Dengue and AIUO at baseline, Days 3,7,28 and 180 of follow-up. Most episodes (67%) consistent with the PAHO definition of probable Zika could not be confirmed as due to any flavivirus and classified as Acute Illnesses of Unidentified Origin (AIUO). Infections by Zika and dengue accounted for 8.4% and 16% of episodes. Dengue patients presented with fever, generalized non-macular rash, arthralgia, and petechiae more frequently than patients with Zika during the first 10 days of symptoms. Dengue patients presented with more laboratory abnormalities (lower neutrophils, lymphocytosis, thrombocytopenia and abnormal liver function tests), with thrombocytopenia lasting for 28 days. Zika patients had conjunctivitis, photophobia and localized macular rash more frequently than others. Few differences persisted longer than 10 days after symptoms initiation: conjunctivitis in Zika infections, and self-reported rash and petechia in dengue infections. CONCLUSIONS: Our study helps characterize the variety and duration of clinical features in patients with Zika, dengue and AIUO. The lack of diagnosis in most patients points to need for better diagnostics to assist clinicians in making specific etiologic diagnoses.

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Fever of undetermined origin (FUO) is a challenging entity with a striking presence in hospitals around the world. It is defined as temperature ≥ 37.8 ° C on several occasions, lasting ≥ three weeks, in the absence of diagnosis after three days of hospital investigation or 3 outpatient visits. The main etiologies are infectious, neoplastic, and non-infectious inflammatory diseases. The diagnosis is based on the detailed clinical history and physical examination of these patients, in order to direct the specific complementary tests to be performed in each case. The initial diagnostic approach of the FUO patient should include non-specific complementary exams. Empirical therapy is not recommended (with few exceptions) in patients with prolonged fever, as it may disguise and delay the diagnosis and conduct to treat the specific etiology. The prognosis encompasses mortality of 12-35%, varying according to the baseline etiology.

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SUMMARY Fever of undetermined origin (FUO) is a challenging entity with a striking presence in hospitals around the world. It is defined as temperature ≥ 37.8 ° C on several occasions, lasting ≥ three weeks, in the absence of diagnosis after three days of hospital investigation or 3 outpatient visits. The main etiologies are infectious, neoplastic, and non-infectious inflammatory diseases. The diagnosis is based on the detailed clinical history and physical examination of these patients, in order to direct the specific complementary tests to be performed in each case. The initial diagnostic approach of the FUO patient should include non-specific complementary exams. Empirical therapy is not recommended (with few exceptions) in patients with prolonged fever, as it may disguise and delay the diagnosis and conduct to treat the specific etiology. The prognosis encompasses mortality of 12-35%, varying according to the baseline etiology.

RESUMO Febre de origem indeterminada (FOI) é uma entidade desafiadora com presença marcante nos hospitais de todo o mundo. É definida como temperatura ≥37,8 ° C em várias ocasiões, com duração ≥3 semanas, na ausência de diagnóstico após três dias de investigação hospitalar ou três consultas ambulatoriais. As principais etiologias são de ordem infecciosa, neoplásica e doenças inflamatórias não infecciosas. O diagnóstico é baseado na história clínica e no exame físico minuciosos desses pacientes, com a finalidade de direcionar os exames complementares específicos a serem realizados em cada caso. A abordagem diagnóstica inicial do paciente com FOI deve incluir exames complementares inespecíficos. A terapia empírica não é recomendada (com poucas exceções) em pacientes com febre prolongada, uma vez que ela pode camuflar e retardar o diagnóstico e a conduta para tratar a etiologia específica. O prognóstico engloba uma mortalidade de 12-35%, variando de acordo com a etiologia de base.

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Fever of undetermined origin (FUO) is a challenging entity with a striking presence in hospitals around the world and can be associated with a myriad of differential diagnoses. It is defined as axillary temperature ≥ 37.8 ° C on several occasions, lasting ≥ three weeks, in the absence of diagnosis after three days of hospital investigation or three outpatient visits. The main etiologies are: infectious, neoplastic, and rheumatic. The diagnosis is based on the detailed clinical history and physical examination of these patients, in order to direct the specific complementary tests to be performed in each case. Empirical therapy is not recommended (with few exceptions) in patients with prolonged fever, as it may disguise and delay the diagnosis and conduct to treat the specific etiology. The prognosis encompasses mortality of 12% - 35%, varying according to the underlying etiology. In this sense, the objective of this study is to review the main topics about fever of undetermined origin, bringing historical and scientific aspects, national and international.

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SUMMARY Fever of undetermined origin (FUO) is a challenging entity with a striking presence in hospitals around the world and can be associated with a myriad of differential diagnoses. It is defined as axillary temperature ≥ 37.8 ° C on several occasions, lasting ≥ three weeks, in the absence of diagnosis after three days of hospital investigation or three outpatient visits. The main etiologies are: infectious, neoplastic, and rheumatic. The diagnosis is based on the detailed clinical history and physical examination of these patients, in order to direct the specific complementary tests to be performed in each case. Empirical therapy is not recommended (with few exceptions) in patients with prolonged fever, as it may disguise and delay the diagnosis and conduct to treat the specific etiology. The prognosis encompasses mortality of 12% - 35%, varying according to the underlying etiology. In this sense, the objective of this study is to review the main topics about fever of undetermined origin, bringing historical and scientific aspects, national and international.

RESUMO Febre de origem indeterminada (FOI) é uma entidade desafiadora com presença marcante nos hospitais de todo o mundo, à qual uma miríade de diagnósticos diferenciais podem estar associados. É definida como temperatura axilar ≥37,8 0 C em várias ocasiões, com duração ≥ três semanas, na ausência de diagnóstico após três dias de investigação hospitalar ou três consultas ambulatoriais. As principais etiologias são de ordem infecciosa, neoplásica e reumatológica. O diagnóstico é baseado na história clínica e no exame físico minuciosos desses pacientes, com a finalidade de direcionar os exames complementares específicos a serem realizados em cada caso. A terapia empírica não é recomendada (com poucas exceções) em pacientes com febre prolongada, uma vez que ela pode camuflar e retardar o diagnóstico e a conduta para tratar a etiologia específica. O prognóstico engloba uma mortalidade de 12-35%, variando de acordo com a etiologia de base. O objetivo deste estudo é revisar os principais tópicos acerca da febre de origem indeterminada, trazendo aspectos históricos e científicos, nacionais e internacionais.

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La enfermedad de Whipple es una entidad multisistémica de origen infeccioso causada por una bacteria Gram positiva perteneciente a la familia de los actinomicetos denominada Tropheryma whippleii. Constituye una causa infecciosa infrecuente de fiebre de origen desconocido. Se presenta el caso de un paciente masculino de 65 años con cuadro febril de 3 años de evolución, poliartralgias, edema en miembros inferiores, adenopatías periféricas y diarreas ocasionales. Se describen la evolución clínica, los estudios de laboratorio, imagenológicos e histológicos que permitieron hacer el diagnóstico de enfermedad de Whipple. Se considera que la publicación de este caso es importante pues contribuye a mantener presente esta enfermedad entre las posibilidades diagnósticas de los pacientes con fiebre de origen desconocido, aún por lo atípico de esta forma de presentación(AU)

Whipple's disease is a multisystem entity of infectious origin caused by a Gram-positive bacterium called Tropheryma whippleii of the actinomycetes family. This is an infrequent infectious disease causing fever of unknown origin. We present the case of a 65-year-old male patient with a 3-year history of fever, polyarthralgia, lower limb edema, peripheral lymphadenopathy, and occasional diarrhea. The clinical evolution, the laboratory results, imaging and histological studies that allowed the diagnosis of Whipple's disease are described. The publication of this case is considered important because it contributes to keep this disease into account among the diagnostic possibilities of patients with fever of unknown origin, since the atypical nature of this form of presentation(AU)

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La lista de etiologías en la fiebre de origen desconocido (FOD) es extensa, siendo las infecciones una causa significativa. Aunque en la actualidad, la mayoría de los casos se deben a desórdenes inflamatorios no infecciosos. La enfermedad de Still del adulto (ESA) es una entidad poco frecuente que sólo debe considerarse luego de descartar otras etiologías. El diagnóstico es clínico ya que no se disponen de métodos complementarios específicos. El curso clínico se divide en 3 patrones: monofásico, con curso de semanas o meses, intermitente, en brotes y articular crónico. Los fármacos antiinflamatorios no esteroideos y los glucocorticoides son útiles en la enfermedad aguda; dado que las recaídas son comunes, la necesidad de terapia inmunosupresora es frecuente. (AU)

Many conditions may cause fever of unknown origin (FUO). While infections remain a significant cause, most FUOs are caused by noninfectious inflammatory disorders. Adult onset Still's disease (AOSD) is a rare condition that should be considered only after the exclusion of other disorders that can cause FUO. The diagnosis of AOSD remains clinical as other diagnostic markers are not available yet1. The disease may present with three different patterns: monophasic, intermittent with relapses and chronic articular . Typically, AOSD is treated with NSAIDs and glucocorticoids, however, relapses are frequent ensuing the use of immunosuppressive drugs. (AU)

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