Microbio help please?

Choices: Brucellosis, malaria, relapsing fever, rocky mountain spotted fever, Ebola hemorrhagic fever

The patient鈥檚 fever spikes each evening. Oxidase-positive, gram-negative cocci were isolated from a lesion on his arm. What is your diagnosis?

The patient was hospitalized with fever and headache. Spirochetes were observed in her blood. What is your diagnosis?

OK, the first key word is spirochetes. Spriochetes come in few diseases, but two of them are, Syphilis and Lyme disease, Brucellosis often shows up with Lyme disease, because the ticks carry the bacterium. So I am going to say your first choice is Brucellosis. But now the lesion on the arm? What would cause that, Lyme disease? The patient's fever spikes each evening, means he has had more than one evening, so we rule out Ebola. Relapsing fever, aha, relapsing fever can be traced to Borrelia which also goes with Lyme disease and is one of the diseases that has sprochetes.
I may be wrong, but I am going to go with either Lyme Disease or Rocky Mountain Spotted Fever, both of which are caused by ticks. Since Lyme disease is not mentioned in your list, study Rocky Mountain Spotted Fever. Hope this helps.

Ebola hemorrhagic fever

Gram negative, oxidase positive cocci sure sounds like a Neisseria species. None of your choices fit this criteria.

My vote for the first one is either gonorrhoeae or meningitis caused by Neisseria.

The second one actually sounds more like syphyllis - caused by Treponema palladium.
Again, not on your list.

Actually you don't give enough information to make an iron-clad diagnosis. Too many other, likely choices.

I'm a Microbiologist.