Introduction. BCG, or bacille Calmette-Guerin, is a vaccine for tuberculosis (TB) disease. Many foreign-born persons have been BCG-vaccinated. BCG is used in many countries with a high prevalence of TB to prevent childhood tuberculous meningitis and miliary disease.CG, or bacille Calmette-Guerin, is a vaccine for tuberculosis (TB) disease. Many foreign-born persons have been BCG-vaccinated.
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Continuous Digital Coded Squelch System (CDCSS), Digital Private Lineâ¢ (DPLâ¢), Digital Channel Guardâ¢ (DCGâ¢), etc. The Continuous Digital Coded Squelch System (CDCSS), was the follow-on to CTCSS (but some books use Code instead of Coded in the name). Instead of a constant low frequency tone, CDCSS superimposes a continuous repeating data or code stream of 23-bit square wave digital data words on the transmitted signal at a bit rate of 134.4 bits per second (with a tolerance of + or - 0.4 bps).