Medically important microbes

Question 1

Gram +ve microbes

Answer 1

Bacilli - listeria sp, clostridium sp

Cocco - staphylococci, streptococci

Question 2

Gram -ve microbes

Answer 2

Bacilli - E coli, salmonella, campylobacter, legionella

Cocci - Neisseria meningitidis, N. gonorrhoeae

Question 3

Parasites classification

Answer 3

Ectoparasites - live on skin and hair eg scabies, live
Endoparasites - live on mucosal surfaces or in tissues. Protozoa (single cells eg malaria) or helminths (worms eg schistosoma)

Question 4

Otitis externa typically caused by

Answer 4

Pseudomonas aeruginosa

• resistant to penicillin, amoxicillin and ceftriaxone/cefotaxime
• environmental, opportunistic

Question 5

Common streptococcus causing:
Pharyngitis
Pneumonia
Skin and soft tissue infections
UTI

Answer 5

• Group A strep
• S. pneumoniae
• Beta-haemolytic streptococci (esp GAS)
• Group B strep, enterococci

Question 6

Gram stain

Answer 6

purple = positive
pink = negative

Question 7

Treat staph aureus

Answer 7

Flucloxacillin

- unless MRSA (methicillin resistant)

Question 8

Septic pt not responding to broad spec Abx, think:

Answer 8

Fungi

Question 9

Pharyngitis, lymphadenopathy, fatigue

Answer 9

think EBV or CMV

- treatment usually only if severe, in pregnant women or immunocompromised

Question 10

Virus of common cold

Answer 10

Rhinovirus

Question 11

Treat influenza in severe infections and vulnerable pateints

Answer 11

Oseltamivir, zanamivir

Question 12

Facultative aerobic/anaerobic

Answer 12

Grow in both aerobic and anaerobic conditions eg Enterobacteriaceae-
E coli
Klebsiella sp.
Proteus sp.