Among 84 strains of bifidobacteria tested, 62%, belonging to animal species
, decreased in count by less than one log 10 unit after 4 days of contact w
ith air at a temperature of 20 degrees C. When 10 strains each of B. pseudo
longum subsp. pseudolongum and B. thermophilum were tested at 4 degrees C u
nder the same conditions, eight of the former and five of the latter surviv
ed without any decline during 4 days. (C) 2000 Academic Press.