LONG-TERM PRESERVATION OF STREPTOCOCCI

Strains of 12 T types of group A streptococci preserved by sand desicc ation and stored at 4 degrees to 10 degrees C were regularly sub-cultu red to check their viability. For this, streptococci coated onto sand particles mixed with sterile sheep blood were inoculated into Todd-Hew itt broth with added blood and incubated for 24 to 48 h. Checking for viability every six months showed that group A streptococci could be p reserved by this method for 21 yr. Our study shows that sand desiccati on is a convenient and cheap method for the long-term preservation of streptococci in laboratories, where other methods of preservation are not feasible on a regular basis.