MICRO: Meeran Bugs

Question 1

Gram Negative intracellular diplococci
19y/o with septic arthritis

Answer 1

Neiserria (Gonnorrhoea)
Most common cause of septic monoarthritis between 19-30
Have a STI with weak treatment - then weeks later presents in joint

Question 2

Gram Negative intracellular diplococci
19y/o with meningitis

Answer 2

Neiserria Meningitidis

Question 3

6y/o child with meninitis and gram negative rods

Answer 3

H. Influenzae (usually unvaccinated children)
Ecoli is gram negative rods - but usually only in premature children

Question 4

19 y/o student with gram + diplococci on blood culture
pyrexial and confused

Answer 4

Strep pneumoniae

Question 5

Student where you cant culture anything, but cold agglutinins are positive

Answer 5

Mycoplasma

Question 6

19 y/o with boil on his leg with gram +ive cocci in clusters

Answer 6

Staphylococcus Aureus - aggressive
(Epidermidis - less common)

Question 7

19y/o with pyrexia of unkown origin
Blood cultures afeter 2 months show Gram + cocci

Answer 7

Strep viridans
(we all have it on our teeth - often infective after dental work eg. infective endocarditis)

Question 8

Signs of Subacute endocarditis

Answer 8

Splenomegaly, Microscopic haematuria
Splinter Haemorrhage, Osler nodes, Janeway lesions, clubbing
eg. in older people - over months

Acute - without signs - usually IV drug users - Staph Aureus - weeks