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The production of streptococcus pyogenes serum opacity factor is associated with GAS strains that are tropic for the skin, and as such are correlated with diseases such as impetigo and acute glomerulonephritis. In this study Aboriginal sera and saliva samples were used to study the immune response to streptococcus pyogenes serum opacity factor resulting from infection by streptococcus pyogenes. [ABSTRACT FROM AUTHOR]

Serovars of Salmonella enterica encounter various microenvironments in the process of cycling through their numerous host and non-host niches. Many of these environs are less than optimal for growth and can even threaten viability. [ABSTRACT FROM AUTHOR]