Abstract
Pseudomonas aeruginosa isolates usually appear as non-mucoid colonies when cultured on agar media, but respiratory isolates from patients with cystic fibrosis (CF) characteristically produce mucoid colonies (Fig. 4.1). It is important at this point to make the distinction between the exopolysaccharide produced by mucoid P. aeruginosa and slime, which is a loosely defined material with variable composition depending upon the strain and cultural conditions. The distinction is crucial for an understanding of the nature of mucoid P. aeruginosa and has not always been appreciated even by those attempting to clarify terminology. Several different morphological types of colony are produced by P. aeruginosa and have been described in detail by Phillips (1969). Classic non-mucoid strains, Phillips’ colonial types 1–4, produce slimy colonies and viscid broth cultures only when incubation is prolonged and in gluconate media or media with a high carbon content, and such slime production is characteristic of all P. aeruginosa (Haynes, 1951). The term ‘mucoid’ is restricted to those strains producing the large watery colonial type 5 of Phillips (1969) within 24 h on common agar-based media and whose mucoid appearance results from the copious production of the polyuronide, alginate. The debilitating pathological sequelae of colonization by mucoid P. aeruginosa are a major cause of morbidity and mortality in CF patients (Høiby, 1984; Pier, 1986; Govan, 1988) and the involvement of P. aeruginosa alginate in the complex pulmonary pathogenesis results in ‘one of the most bizarre and intractable bacterial infections known to modern science’ (Deretic et al., 1987a).
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Govan, J.R.W. (1990). Characteristics of mucoid Pseudomonas aeruginosa in vitro and in vivo . In: Gacesa, P., Russell, N.J. (eds) Pseudomonas Infection and Alginates. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1836-8_4
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