Evaluation of liquid nitrogen storage for preservation of group A streptococcal M protein-sensitized sheep red blood cells.
Streptococcal M protein-sensitized sheep red blood cells stored in liquid nitrogen showed insignificant change in titer when tested against homologous antisera over a 6-month period. This method eliminates much of the preparation time required for the passive hemagglutination procedure and increases the reproducibility of the test.
D000818:Animals; D000937:Antigen-Antibody Reactions; D004912:Erythrocytes / Q000276:immunology*; D005615:Freezing; D006386:Hemagglutination Tests; D009584:Nitrogen; D011309:Preservation, Biological; D011817:Rabbits; D012756:Sheep; D013291:Streptococcus / Q000276:immunology
D009584:Nitrogen