The present invention provides yeast belonging to the genus Saccharomyces
which generates, in dough containing 5% sugar, carbon dioxide gas in an
amount of not less than 2.0 ml per g of the dough and not less than 1.20
ml per ml of volume expansion of the dough at 38.degree. C. in 60
minutes; a method of screening for the yeast; bread dough containing the
yeast; a process for making bread using the yeast; and bread having an
anti-mold effect which is obtained by the process.