Survival of Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis frozen in skim milk- tryptone-glucose-glycerol medium.
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.
Kaijalainen
Tarja
T
KTL, National Public Health Institute, Oulu, Helsinki, Finland. tarja.kaijalainen@ktl.fi
Ruokokoski
Esa
E
Ukkonen
Pentti
P
Herva
Elja
E
D000818:Animals; D002417:Cattle; D003470:Culture Media; D005947:Glucose / Q000494:pharmacology; D005990:Glycerol / Q000494:pharmacology; D006193:Haemophilus influenzae / Q000254:growth & development*; D008892:Milk; D001936:Moraxella catarrhalis / Q000254:growth & development*; D009305:Nasopharynx / Q000382:microbiology*; D010461:Peptones / Q000494:pharmacology; D013296:Streptococcus pneumoniae / Q000254:growth & development*
D003470:Culture Media; D010461:Peptones; C001830:tryptones; D005947:Glucose; D005990:Glycerol