Struvite stones, form only when the upper urinary tract is infected with urease-producing bacteria such as Proteus mirabilis, Klebsiella pneumoniae, Staphylococcus,

saprophyticus.

.

You certainly can calcúlate the positive predictive value, you have 85% of the deseased that tested positive, so they are true positives, you also have 15% that tested positive but have no symptoms so they are false positive, since PPV= TP/TP+FP x 100, then you have all the information you need in order to obra in the positive predictive value, so i think tour answer might be wrong..

A 58-year-old man presents with history of recurrent rashes that became severe in the last week. The rashes were erythematous with a fine, sandpaper-like texture. He also reports having a fever and symptoms of a sore throat two weeks prior to the rash. Examination reveals a 'strawberry tongue'. Based on the history and physical examination, what mechanism is the most likely cause of this patient's symptoms?

correct answer: type 4 hypersensitivity

I picked the answer "direct toxins from bacterial exotoxins"

why is this type 4 hypersensitivity? please explain

The patient in this case is 70 years old. At this age, an corneal arcus is fairly common. Given the circumstances, FH would not be my first thought. If the patient was young (<50), hyperlipidemia/FH would be a more likely differential diagnosis.

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This the messege i have in my mind

If no Kussmaul sign, unlikely constrictive pericarditis or cardiac tamponade( absence of muffled heart sounds also rules this out).

No forward symptoms, thus rules out aortic stenosis.

Being an acute condition rules out MVP as MVP in a chronic setting can progress to Right heart failure symptoms.

But here it's an acute presentation, so most probably acute post-MI Right ventricular failure.

can someone please help with this. Any ideas?

Dermatology

Herpes Simplex Virus

Revisee

did not hear about this disease before, must review

How to understand these type of questions

Are you looking for a study partner? This is a great place to offer help or look for support.

stool in cholera is rice watery- NOT yellow right? rice water is whitish/translucent

they mentioned normal limits of RBC and glucose. testosterone induces erythropoiesis and decrease in it would decrease the RBCs too

Why is not Levodopa the right answer here?

she did not have to acquire new skills after her injury and lack of adaptation would cause weakness in left leg

In the question says "Blood cultures grew gram-positive cocci in clusters" which made me think of Staph but the medical history madde me think of Strep. Now, I don´t know if it was a coinfection or what happened there