quellung reaction meaning in Hindi

Examples

1. Since then over ninety serovars have been discovered, each with a unique polysaccharide capsule that can be identified by the quellung reaction.
2. A German bacteriologist, Fred Neufeld, had discovered the three pneumococcal types ( Types I, II, and III ) and discovered the Quellung reaction to identify them in vitro.
3. The pneumococcal Quellung reaction was first described in 1902 by the scientist Fred Neufeld, and applied only to " Streptococcus pneumoniae ", both as microscopic capsular swelling and macroscopic agglutination ( clumping visible with the naked eye ).
4. However, it acquired an important practical use with the advent of serum therapy to treat certain types of pneumococcal pneumonia in the 1920s because selection of the proper antiserum to treat an individual patient required correct identification of the infecting pneumococcal serotype, and the Quellung reaction was the only method available to do this.
5. The Quellung reaction has been used to identify the 93 known capsular serotypes of " Streptococcus pneumoniae " in diagnostic settings, but in recent years it has been challenged by the latex agglutination method, and further by molecular typing techniques such as the polymerase chain reaction, which detect DNA and therefore target genetic differences between serotypes.