Q21) Hands of ICU personnel are most commonly infected with
a) Staph epidermis
b)Mrsa
c) Mssa
d) Acineobacter
Ans d
Most Acinetobacter isolatesrecovered from hospitalized patients represented colonization rather than infection, especially in the ICU setting, being particularly common with endotracheal intubation, multiple IV catheters, monitoring devices, surgical drains, urinary catheters, or prior antimicrobial therapy.
Q22. Most common organism causing necrotising fascitis
a) Beta hemolytic streptococcus
b) Staph Aureus
c) E coli
d) Proteus
Ans a
Necrotising fasciitis results from synergistic, polymicrobial infection; most commonly a streptococcal species (Group A β-haemolytic) in combination with Staphylococcus, Escherichia coli, Pseudomonas, Proteus, Bacteroides or Clostridia. 80% have a history of previous trauma/infection and over 60% commence in the lower extremities.
Ref Bailey 597
Q 23) AIDS defining neoplasm is
a) Ca cervix
b) Ca anal canal
c) CA oropharynx
d) HCC
Ans a
AIDS defining neoplasm is a type of cancer that a person infected with human immunodeficiency virus (HIV) is at high risk of developing. AIDS-defining cancers include Kaposi sarcoma, certain types of non-Hodgkin lymphoma, and cervical cancer.
Q24) Least common Signs or symptoms of necrotising infections is a) Unusual pain b) Oedema beyond area of erythema c) Crepitus d) Fever
Ans d
Fever is unusual
Signs and symptoms of necrotising infections ● Unusual pain ● Oedema beyond area of erythema ● Crepitus ● Skin blistering ● Fever (often absent) ● Greyish drainage (‘dishwater pus’) ● Pink/orange skin staining ● Focal skin gangrene (late sign) ● Shock, coagulopathy and multiorgan failure
Ref Bailey 27th page 30
Q 25 Which organism does not follow the Koch's postulates?
a) Mycobacterium tuberculosis
b) Mycobacterium Leprae
c) E coli
d) Clostridium
Ans b
Not every organism that causes disease can be grown in culture, the commonly quoted one being
Mycobacterium leprae which causes leprosy
Koch’s postulates proving whether a given organism is
the cause of a given disease
●● It must be found in every case
●● It should be possible to isolate it from the host and grow it in
culture
●● It should reproduce the disease when injected into another
healthy host
●● It should be recovered from an experimentally infected host
