infectious diseases

An 85-year-old man from a nursing home presents with new confusion, mild cough, and temperature 37.9°C. Chest X-ray shows a right lower lobe infiltrate. He has dysphagia. Considering his presentation and risk factors, which initial antibiotic regimen is most appropriate?

A 28-year-old female presents with a chronic cough and fatigue. She has no significant past medical history but reports recent travel to Southeast Asia. A chest PET-CT was performed. What is the MOST appropriate next step in the management of this patient?

A 48-year-old woman presents to her GP with a 3-month history of increasing fatigue, exertional dyspnoea, and a persistent cough productive of small amounts of mucus. She mentions a history of recurrent 'sinus infections' over the past year, often treated with antibiotics. She has recently felt lightheaded on standing. On examination, her blood pressure is 95/60 mmHg, pulse 88 bpm, respiratory rate 20 breaths/min, and oxygen saturation 96% on room air. Chest auscultation reveals diffuse expiratory wheezes. Blood tests performed last week show haemoglobin 85 g/L (reference range 120-150), MCV 72 fL (reference range 80-100), and normal white cell count and platelet count. Spirometry performed concurrently shows an FEV1/FVC ratio of 0.65 (predicted >0.70) with partial reversibility after bronchodilator. Considering the clinical presentation and investigations, what is the most appropriate next step in management?

A 28-year-old woman, 18 weeks pregnant, presents to her GP two days after her 5-year-old son developed varicella. She is unsure of her immunity status and is asymptomatic. Which of the following is the most appropriate initial management step?

A patient with community-acquired pneumonia has a CURB-65 score of 3. What is the most appropriate management setting?

A 10-year-old boy presents to the pediatric clinic with a history of fever, a rash characterized by erythema marginatum, and migratory arthralgia. His mother reports that he had a sore throat about three weeks ago, which resolved without treatment. On examination, he has a temperature of 38.5°C, a heart rate of 110 bpm, and a faint erythematous rash on his trunk. His joints are tender but not swollen. Given the suspicion of acute rheumatic fever, which of the following is the most appropriate next step in management?

A refugee family from Iraq has registered at your clinic, having settled 6 months ago. What is an important consideration for their health assessment in the Australian context?

A 3-year-old boy is brought to the emergency department by his parents due to a high fever and irritability. He has had a runny nose and cough for the past two days. On examination, he is lethargic and has a bulging fontanelle. A lumbar puncture is performed, and the cerebrospinal fluid (CSF) analysis shows elevated protein, low glucose, and a high white cell count with a predominance of neutrophils. What is the most likely diagnosis?

A 32-year-old woman presents to the emergency department with a 2-day history of fever, chills, and right flank pain. She has a history of recurrent urinary tract infections. On examination, she is febrile with a temperature of 38.5°C, her heart rate is 110 bpm, and her blood pressure is 110/70 mmHg. There is tenderness on palpation of the right costovertebral angle. Urinalysis shows pyuria and bacteriuria. What is the most appropriate initial management for this patient?

A 10-year-old presents with a sore throat, fever, and fatigue for 2 days. Examination reveals tonsillar exudates and tender anterior cervical lymph nodes. What is the most appropriate next step in management?

A 45-year-old male with poorly controlled diabetes mellitus and ischaemic heart disease, living in a rural Indigenous community, presents with fevers, cough, lethargy, night sweats, and occasional hemoptysis. What is the most appropriate initial investigation for suspected tuberculosis in this patient if he is unable to produce sputum spontaneously?

A patient with community-acquired pneumonia has a CURB-65 score of 3. What is the most appropriate management setting?

A 30-year-old woman presents to her GP with a 2-week history of a persistent cough, night sweats, and unintentional weight loss. She has recently returned from a trip to Southeast Asia. On examination, she appears thin and has crackles in the upper zones of her lungs. A chest X-ray shows cavitary lesions in the right upper lobe. What is the most likely diagnosis?

A 30-year-old immigrant presents with chronic cough and night sweats. Sputum is negative for AFB. What is the MOST appropriate next step in management?

A 48-year-old sheep farmer presents to his GP with a two-week history of persistent fever, severe retro-orbital headache, and profound fatigue. He denies cough, shortness of breath, or rash. On examination, his temperature is 38.5°C, pulse 85 bpm, BP 120/80 mmHg. The remainder of the examination, including chest auscultation, is unremarkable. He has not travelled outside the region recently.

A 55-year-old patient with a history of solid organ transplant on immunosuppressive therapy presents with a two-week history of intermittent fever, chills, and dull right upper quadrant pain. On examination, there is mild tenderness in the right upper quadrant. Blood tests reveal a white cell count of 14 x 10^9/L and CRP of 120 mg/L. Imaging is performed. Considering the clinical context and the provided images, what is the most appropriate immediate next step in the management of this patient?

A 23-year-old backpacker doing farm work presents with a low-grade fever for 4 days. Q fever is suspected. What is the most appropriate diagnostic method for acute Q fever in Australia?

A 25-year-old gentleman presents with 3 days of rhinorrhea, fever, cough, and abdominal pain. On examination, his temperature is 39.6°C, he has reduced breath sounds, and an enlarged spleen. Which of the following causative pathogens, if identified, would require mandatory notification in Australia?

A 55-year-old farmer presents with a week of fever, severe headache, and myalgia. He reports recent exposure to lambing ewes on his property. Physical examination is unremarkable except for mild hepatomegaly and normal vital signs. Considering the patient's occupation, exposure history, and clinical presentation, what is the most likely diagnosis?

A 55-year-old man with a history of renal transplant on immunosuppression presents with a 2-week history of low-grade fever, malaise, and dull right upper quadrant discomfort. Physical examination is unremarkable except for mild tenderness on deep palpation of the right upper quadrant. Blood tests show a mild leucocytosis and elevated CRP. Imaging is performed. Based on the clinical presentation and imaging findings, what is the most appropriate next diagnostic step?

A 32-year-old male, recent immigrant from a high-TB prevalence country, presents with a persistent cough and night sweats for the past two months. He denies fever or weight loss. Physical examination is unremarkable except for mild, diffuse rhonchi on auscultation. Sputum cultures are pending. A PET-CT scan of the chest was performed, the axial view is shown. Given the clinical context and imaging findings, what is the MOST appropriate next step in management?

A 10-year-old presents with a sore throat, fever, and tonsillar exudates. Rapid strep test is negative. What is the MOST appropriate next step?

A 28-year-old female, recently emigrated from Southeast Asia, presents to her general practitioner with complaints of fatigue, a persistent low-grade fever (37.8°C), and a non-productive cough that has been present for approximately one month. She denies any significant past medical history and is not currently taking any medications. Physical examination reveals slightly diminished breath sounds in the upper right lobe, but is otherwise unremarkable. Initial blood work, including a complete blood count and comprehensive metabolic panel, are within normal limits. A chest X-ray revealed a suspicious lesion in the right upper lobe, prompting a PET-CT scan, an axial slice of which is shown. Given the patient's history, clinical presentation, and the findings on the PET-CT scan, which of the following is the MOST appropriate next step in the diagnostic workup?

A 55-year-old patient with a history of solid organ transplant on immunosuppressive therapy presents with a 2-week history of low-grade fever, malaise, and dull right upper quadrant discomfort. Physical examination is unremarkable except for mild tenderness in the right upper quadrant. Blood tests reveal a CRP of 85 mg/L (normal <5), WCC 11.5 x 10^9/L (normal 4-11), and mildly elevated alkaline phosphatase. Imaging is performed as shown. What is the most appropriate next step in management?

A 24-year-old woman presents to the emergency department with a 3-day history of fever, sore throat, and fatigue. She also reports a rash that developed after taking amoxicillin prescribed by her GP for a presumed bacterial throat infection. On examination, she has cervical lymphadenopathy, a diffuse maculopapular rash, and mild splenomegaly. Her vital signs are stable. A monospot test is positive. Which of the following is the most likely explanation for the rash?

A 35-year-old lady who underwent laparoscopic appendicectomy presents 3 days later with diarrhea, fever (39.5°C), and erythematous port sites. She had a 5-day course of cefotaxime. What is the most likely diagnosis?

A 58-year-old non-smoker presents with a 4-month history of intermittent fever, night sweats, and a persistent cough productive of small amounts of sputum. He recently emigrated from a region with a high prevalence of tuberculosis. Physical examination is unremarkable. Chest X-ray reveals a solitary nodule in the right upper lobe. A PET-CT scan is performed as part of the investigation. Considering the findings demonstrated in the image provided in the context of this patient's presentation, which of the following is the most appropriate next step in the management of this patient?

A 10-year-old presents with a sore throat, fever, and tonsillar exudates. Rapid strep test is negative. What is the most appropriate next step?

A 28-year-old immunocompetent patient presents with a chronic cough and low-grade fever. Initial investigations, including sputum microscopy, are negative. A PET-CT scan was performed (image shown). What is the MOST appropriate next step?

A 35-year-old man, recently arrived from a country with a high burden of tuberculosis, presents to the emergency department with a 2-week history of worsening headache, low-grade fever, and general malaise. Over the past 48 hours, he has become increasingly drowsy and confused. He denies cough, weight loss, or night sweats. His past medical history is unremarkable, and he is not on any regular medications. On examination, he is febrile (38.5°C), drowsy but rousable, with a Glasgow Coma Scale (GCS) of 13/15 (E3 V4 M6). His neck is stiff, and Kernig's sign is positive. Fundoscopy is normal. Chest auscultation is clear. Neurological examination reveals no focal deficits. Initial blood tests show a mild lymphocytosis, normal electrolytes, and normal renal and liver function. A non-contrast CT scan of the brain shows subtle basal meningeal enhancement. A lumbar puncture is performed. CSF Results: * Appearance: Slightly turbid * Opening pressure: 25 cm H2O (elevated) * White cell count: 150 cells/µL (normal <5), 80% lymphocytes * Red cell count: 5 cells/µL * Protein: 1.5 g/L (normal 0.15-0.45) * Glucose: 1.8 mmol/L (normal 2.5-4.5), simultaneous blood glucose 5.5 mmol/L Given the clinical presentation and investigation findings, what is the most appropriate immediate next step in management?

A farmer successfully treated for acute Q fever presents 6 months later with unexplained weight loss and night sweats. Physical exam reveals a new murmur. What is the most likely diagnosis?

A 35-year-old woman presents to the emergency department with a 3-day history of fever, chills, and a productive cough with greenish sputum. She has a history of asthma and is currently on inhaled corticosteroids. On examination, her temperature is 38.5°C, blood pressure is 120/80 mmHg, heart rate is 110 bpm, and respiratory rate is 24 breaths per minute. Auscultation of the chest reveals wheezing and crackles in the right lower lung field. A chest X-ray shows consolidation in the right lower lobe. What is the most appropriate initial antibiotic therapy for this patient, considering her asthma and current presentation?

A 56-year-old gentleman, a gardener and cat owner, presents with 24 hours of pain, swelling, and redness on his right index finger. His temperature is 38.1°C and pulse is 72. Suspected gout. What is the most appropriate next step?

A 30-year-old woman presents with fever, hemoptysis, and night sweats. A chest X-ray shows a round lesion with an air-fluid level. What is the most likely diagnosis?

A 28-year-old woman presents to the clinic with a 2-week history of fever, night sweats, and a non-productive cough. She has recently returned from a trip to rural Queensland. On examination, she has crackles in the right upper lung field. A chest X-ray shows a cavitary lesion in the right upper lobe. What is the most likely diagnosis?

A 25-year-old man and a 23-year-old woman, newlyweds, are planning a 3-week trip to South America. The woman is not on oral contraceptives and wants to conceive. They are concerned about Zika. What advice can you provide?

A 45-year-old farmer presents with a 10-day history of fever, severe retro-orbital headache, and myalgia. He denies cough or dyspnoea. Physical examination is unremarkable. What is the most appropriate initial investigation?

A 10-year-old presents with a sore throat, fever, and tonsillar exudates. Rapid strep test is negative. What is the MOST appropriate next step?

A 59-year-old lady with a past history of Type 2 Diabetes Mellitus and hypertension, and no smoking history, presents with a 3-month history of cough, blood-tinged sputum, night sweats, and a 5 kg weight loss. What are the most appropriate initial investigations for the likely diagnosis?

A 35-year-old healthcare worker has a positive tuberculin skin test (12mm induration) following a known occupational exposure. Her chest X-ray is clear, and she reports no symptoms. Which is the most appropriate next step in management?

A 32-year-old male, originally from a high-TB prevalence country, presents to the emergency department with a persistent cough for the past 3 weeks, night sweats, and a 5 kg weight loss. He denies any fever or shortness of breath. Physical examination reveals normal breath sounds bilaterally, with no wheezes or crackles. His vital signs are stable: temperature 37.2°C, heart rate 88 bpm, blood pressure 120/80 mmHg, and oxygen saturation 98% on room air. A chest X-ray was initially interpreted as showing a possible lung mass, prompting further investigation with a PET-CT scan, the axial view of which is shown. Sputum samples have been sent for microscopy and culture, but results are pending. Given the clinical presentation and the imaging findings, what is the MOST appropriate next step in management?

A child has a sore throat and fever. Centor criteria are 3/4. What's the next step?

A 5-year-old boy presents with wheezing, shortness of breath, and a history of recurrent respiratory infections. His symptoms worsen with exercise and during the night. What is the most likely diagnosis?

A 35-year-old man presents to the clinic with a 3-month history of fatigue, weight loss, and night sweats. He also reports a persistent cough that has recently become productive of blood-streaked sputum. He has no significant past medical history and is not on any medications. He recently returned from a trip to Southeast Asia. On examination, he is febrile and has bilateral crackles in the upper lung fields. A chest X-ray shows cavitary lesions in the upper lobes. What is the most likely diagnosis?

For severe community-acquired pneumonia requiring ICU admission, which adjunctive therapy is recommended?

A 3-year-old child is brought to the general practice clinic by his parents due to recurrent episodes of wheezing and cough, particularly following viral upper respiratory tract infections. The child has had multiple similar episodes over the past year, each resolving with bronchodilator therapy. There is no history of eczema or allergic rhinitis, and the family history is unremarkable for atopic conditions. On examination, the child appears well between episodes, with normal growth parameters and no signs of respiratory distress. Auscultation of the chest reveals clear lung fields without wheezes or crackles. Which of the following is the most likely underlying condition?

A 45-year-old recent immigrant from a high-prevalence country has a positive tuberculin skin test (18mm) and negative chest X-ray. He has chronic hepatitis B. Which is the most appropriate initial management for latent tuberculosis infection in this patient?

A 58-year-old male, on chronic immunosuppressants, presents with vague abdominal pain. The images are shown. What is the MOST likely causative organism?

A 5-year-old boy is brought to the clinic by his parents due to a 3-day history of fever, irritability, and refusal to eat. On examination, he has a temperature of 39°C, erythematous oropharynx, and tender cervical lymphadenopathy. There are also vesicular lesions on his hands and feet. What is the most likely diagnosis?

A 58-year-old woman presents with a 7-year history of chronic cough productive of copious, often purulent, sputum, particularly noticeable in the mornings. She reports requiring 4-5 courses of antibiotics annually for exacerbations of her 'chronic bronchitis'. She is a non-smoker and has no significant past medical history other than childhood measles complicated by pneumonia. On examination, she has scattered coarse crackles bilaterally at the lung bases. Her oxygen saturation is 96% on room air. Spirometry performed 3 months ago showed FEV1 78% predicted, FVC 85% predicted, FEV1/FVC 0.75. A recent chest X-ray was reported as showing 'mild peribronchial thickening'. Given the clinical suspicion, what is the single most appropriate next investigation to establish the diagnosis?