Serum glucose agar, a transport medium for Streptococcus pyogenes.

When planning an epidemiological study of streptococcal infection, we were recommended to try serum glucose agar which had proved a useful transport medium in another study.' We compared serum glucose agar with Stuart's transport medium, which was our laboratory's usual transport medium for delicate organisms and with dry serum-coated swabs. We also considered the commercially available systems but found that none was sufficiently cheap and robust for our needs. This brief report describes our assessment of serum glucose agar made in our laboratory.