Culture of klebsiella colonies is smooth, indicating the presence of a capsule. A culture of pseudomonas shows rough colonies. Based on this information alone, which species is likely to be more pathogenic?

Klebsiella species

Based on this information alone, Klebsiella species is likely to be more pathogenic because of the presence of capsules.

Capsule is an organized, gelatinous layer that encloses the entire bacterium. Capsules are made up of polysaccharide and it is part of the outer envelope of a bacterial cell. Capsule is a major virulence factor of bacteria as it increases the ability of bacteria to cause disease. Other bacteria that have capsules include Salmonella, Streptococcus pyogenes, and Pseudomonas aeruginosa.