Pseudomonads are environmental gram-negative, oxidase-positive bacterial organisms. Pseudomonas aeruginosa is the type strain of the genus and has been the cause of several high profile Hospital Acquired Infections (HAIs).
Commonly found in soil and ground water, Pseudomonas aeruginosa is increasingly important clinically as it is both a major cause of healthcare associated infections and is increasingly resistant to many antibiotics. Pseudomonas is an opportunistic pathogen being more likely to infect those patients who are already unwell and particularly those that are immunocompromised. In hospitals the organism contaminates moist/wet reservoirs such as respiratory equipment and indwelling catheters and infections can occur in almost every body site but are particularly serious in the bloodstream (bacteraemia). Most community-acquired infections are associated with prolonged contact with contaminated water.