Sputum: Haemophilus influenzae – Shipped May 2013
A simulated sputum sample obtained from a 60 year old hospitalized patient with an acute chronic obstructive pulmonary disease (COPD) exacerbation was sent to category A and B laboratories.
Participants were expected to isolate, identify, and report Haemophilus influenzae; labs were also expected to test and report antibiotic susceptibilities.
MAIN EDUCATIONAL POINTS from M131-2
- Whereas a positive β-lactamase test indicates ampicillin resistance, a negative result for Haemophilus influenzae may not accurately predict ampicillin susceptibility because of the presence of other resistance mechanisms.
- CMPT supports the testing of ampicillin if the β-lactamase test is negative to avoid mistreating patients with ampicillin-resistant H. influenzae infections.