Category: P

Previously in 4 other successive genera, this motile non-pigmented organism is associated with rodent disease, and is a hazard to laboratory workers. Oxidase positive and gelatin liquefying, the organism is inhibited on deoxycholate and CTAB media which allow growth of other pseudomonads.  

Order of Gram-negative bacteria, usually motile rods with polar flagella, some however are coccoid. Many of the families are of no medical interest, but the order includes the Pseudomonodaceae and the Spirillaceae.  

Phenomenon occasionally observed in agglutination or other tests involving progressive dilutions of serum. Some or all of the lower (stronger) dilutions show a negative result, whereas the higher dilutions are positive. The illogically negative series of dilutions is the prozone. Portion of the low dilution range of a homologous serum that fails to agglutinate bacteria…

Group of two enterobacterial species (not as yet a genus) with some of the characteristics of Proteus species—particularly the ability to reduce phenylalanine-but not urease positive. Normally non-pathogenic. Motile, and one (‘A’) produces gas from glucose; ‘B’ is anaerogenic.  

Indole-producing, gelatin-liquefying species. The XI9 strain shares an ‘O’ antigen with some Rickettsia. An essentially saprophytic species that may produce urinary tract infections. A gram-negative, facultatively anaerobic, rod-shaped bacterium found in fecal matter, sewage, and soil. It frequently causes cystitis and pyelonephritis and is linked to eye and ear infections, pleuritis, peritonitis, and suppurative abscesses.…

Indole-producing species—the only one which is citrate positive.  

Indole-producing species, possibly associated with infantile diarrhoea; often concomitant with Shigella infection.  

Non-indole-producing species, the XK strain shares an ‘O’ antigen with some Rickettsia. A species abundant in nature and an occasional human pathogen (e.g., of the urinary tract).  

Measurement of the power of therapeutic sera, vaccines or toxoids to protect susceptible animals (or living tissues in vitro) against infective agents or their toxins.  

Demonstration of an antigen – antibody reaction by overlaying antiserum with toxin or bacterial extract, a ring of white precipitate appearing at the junction if the serum contains the homologous antibody. A test in which two dissolved substances in a solution join to form a visible solid. The results depend on the strength of the…