Legionella pneumophila

Question 1

type

Answer 1

Gram -ve rod
Motile -polar
flagella
Non spore forming
Obligate
intracellular
(alveolar
macrophage)

Question 2

transmission and risk factors

Answer 2

Source: water
source
Inhale
aerosolized
water
Can survive
50C for >30
mins

Question 3

presentation

Answer 3

• Legionnaires disease
• Pontiac fever(self limiting) :
  undifferentiated URT- scratchy
  throat, fever
  Look for GI/CNS involvement
  with respiratory disease PLUS
  WATER SOURCE,POSITIVE
  URINARY AG TEST
  HEMATURIA

Question 4

diagnostic

Answer 4

Cultured on
buffered charcoal
yeast
extract(BCYE)
agar
Urinary Antigen
Test → if
negative but
Legionnaire’s still
suspected then
respiratory
culture required