United State Medical Licensing Examination (Step 1) Set 14

A newborn boy appears to be lethargic and septic. Aspinal tap was performed, and a Gram stain of the spinal fluid revealed gram-positive bacilli. Cultures of the spinal fluid on sheep blood agar plates, at a temperature of 2225

A 25-year-old female presents to her doctor's office with a rash over the malar eminences of her face, sparing the nasolabial folds; a skin rash due to exposure to sunlight; and painless nasopharyngeal ulcers. Suspecting an autoimmune disorder, her physician obtains an antinuclear antibody test of her blood and finds high titers of anti-double-stranded DNA antibodies. Which one of the following diseases is most likely responsible for this immunological reaction?

Administration of which one of the following substances is likely to be most beneficial to this patient?

Amedical student was bitten by infected ticks. In a week, he developed a high fever, headache, muscular aches, nausea, and splenomegaly. Five days later his symptoms subsided. However, 1 week later all his previous symptoms returned. During the next 9 days he went through a recovery and another relapse followed by a final recovery. The overall temperature curve of his illness is shown in below figure. Which of the following is the most likely etiological agent?

A 7-year-old boy experienced respiratory tract inflammation, sore throat, and fever. Labored breathing soon followed the development of a gray membrane in the tonsil area, and diphtheria was diagnosed. Which of the following represents the most immediate course of action by his physician?

An 8-month old boy presents to the emergency room in respiratory distress from a recurrent upper respiratory tract bacterial infection. Labs reveal low levels of IgA, IgD, IgE, IgG, and IgM. Suspecting animmune deficiency disorder, genetic testing reveals a defect in a tyrosine kinase gene. Which of the following would be seen in patients with this immune deficiency disorder?

During a pelvic examination, a woman is found to have painful vesicular lesions on the vagina. The patient states that she had similar lesions 12 months previously which lasted for 2 weeks. Which of the following is the most likely causative agent?

Antibodies against acetylcholine neural receptors were measured in a 35-year-old woman and are thought to be involved in the pathogenesis of which of the following?

Which of the following will be observed in a person who is deficient in interleukin-1 synthesis?

After an abdominal surgery for removal of ovarian cysts, a 56-year-old female has had low-grade fever for the past 2 weeks. She has a history of rheumatic fever as a child. Three of the blood cultures grew gram- positive cocci. Which of the following is the most likely etiologic agent?