CBT stands for "Carica Batterica Totale"; translated as "Total Bacterial Load".

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Note added at 6 mins (2011-04-11 07:26:18 GMT)
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"The total bacterial load (TBL) was determined in the inflowing and outflowing waters and a multifactorial design was employed to investigate the effect of different macroalgal biomass. Microbiological analysis revealed a high TBL in the water column (18.4 ± 7.4 × 108 cells ml−1)."

http://www.springerlink.com/content/j5366ml4n66031g2/

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Note added at 7 mins (2011-04-11 07:27:19 GMT)
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"In questa esperienza abbiamo calcolato la carica batterica totale (CBT) di un campione incognito di acqua. Per carica batterica totale si intende il numero di batteri per millilitro di campione."

http://www.inftube.com/biologia/Carica-Batterica-Totale75645...

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Note added at 8 mins (2011-04-11 07:28:34 GMT)
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"Microrganismi vitali (Carica batterica totale- CBT a 22°C e 36°C) "

http://www.sinal.it/ita/asp/Prove.asp?NumeroAccr=0318&Codice...

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Note added at 9 mins (2011-04-11 07:29:27 GMT)
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"Figure 2 — Bacterial DNA probe results. A: initial test showing the presence of a high Total Bacterial Load (TBL) = 22.86 million and a high percentage (TML = 32 percent) of periodontal pathogens called total marker load (Pg = 19.8 percent, Bf = 12.2 percent). B: Bacterial DNA probe six months later showing both the reduction of the TBL (5.95 million) and the reduction of periodontal pocket pathogens (Pg = .5 percent, Bf = 1.7 percent)."

http://www.dentistryiq.com/index/display/article-display/199...