. The bacteriology of the eye. ke Diplococci. They are Gram-negative, often show distinct polar staining,and are obligate aerobes, only growing at temperatures above 26° C, and withcertainty on media containing blood, especially pigeons, which is so rich inhemoglobin. Exceptionally they grow on serum media (due to an admixture ofhaemoglobin), and occasionally on haemoglobin-free media, in symbiosis with otherorganisms which favour their growth (various Staphylococci, but especially theB. xerosis). Grassberger and Gohn by prolonged cultivation have been able to makesome strains grow on the ordi
. The bacteriology of the eye. ke Diplococci. They are Gram-negative, often show distinct polar staining,and are obligate aerobes, only growing at temperatures above 26° C, and withcertainty on media containing blood, especially pigeons, which is so rich inhemoglobin. Exceptionally they grow on serum media (due to an admixture ofhaemoglobin), and occasionally on haemoglobin-free media, in symbiosis with otherorganisms which favour their growth (various Staphylococci, but especially theB. xerosis). Grassberger and Gohn by prolonged cultivation have been able to makesome strains grow on the ordinary media. In the discharge the bacilli tend to occur in clusters (cf. Fig. 18), like shoals offish. In cultures longer rods occur. • The glanders bacillus and the Ducrey bacillus of soft sore are also Gram-negative, butire larger, and almost never occur in acute conjunctivitis. The Bacillus pyocycmeusis of no importance in conjunctival inflammations, although it is often ^observed in thecornea. 150 BACTERIOLOGY OF THE EYE. Fig. 18.—Conjunctival Secretion from aCase of Dacryocystitis with In-fluenza and Xerose Bacilli. The cultures are very toxic for rabbits, and, according to Cantani, a certainaegree of bactericidal immunity can be produced in them. This, however, is denied by others (Delius andKolle). The variety described by Pfeifferas the pseudo - influenza bacillus,which sometimes forms long coiledthreads in cultures, is considered bymost authors to be the influenzabacillus. Similarly, the Gram-nega -five polbacteria found in whooping-cough,1 measles, and other infec-tious diseases, are very closely re-lated, if, indeed, they are not identi-cal ; as are the other Bacteria withthe characteristics of the influenzabacilli, which are so widespread inthe nasal mucous membrane, andoccasionally occur as saprophyteson other mucous surfaces. Presence in the Eye.—In the purulent secretion of trachoma L. Midler found bacilli, which he showed to resemble influenza bacilli. The
Size: 1586px × 1575px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidbacteriolo, booksubjecteye
