<prompt> Acute exacerbation of COPD is done by all exceptPneumococcusMoraxella catarrhalisH influenzaStaph aureus  <response>: Patients with COPD are frequently colonised with potential respiratory pathogens.Bacteria frequently implicated in COPD exacerbations include Streptococcus pneumoniae,Haemophilus influenzae, and Moraxella catarrhalis.In addition,Mycoplasma pneumoniae or Chlamydia pneumoniae are found in 5-10 of exacerbations. Harrisons medicine-18th edition,page no:2158. 