Journal of Clinical Microbiology 2004-01-01

Survival of Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis frozen in skim milk- tryptone-glucose-glycerol medium.

Tarja Kaijalainen, Esa Ruokokoski, Pentti Ukkonen, Elja Herva

Index: J. Clin. Microbiol. 42 (1) , 412-414, (2004)

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Abstract

In STGG (skim milk, tryptone, glucose, glycerol) medium at -80 degrees C, Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis isolates survived for at least 3 years, and the same species have survived in nasopharyngeal swabs for at least 1.5 years. At -20 degrees C, S. pneumoniae and M. catarrhalis survived for 1.5 years, but H. influenzae survived for only 2 months.