BCG

Live vectors (131,133) are another appHcation of genetic engineering. In this case, the genes from a pathogen are inserted into a vaccine vector, such as salmonella or vaccinia. In the case of salmonella, it will be possible to develop an oral vaccine. Vectors for this appHcation include salmoneUa, BCG, poHo, adenovims, and vaccinia. 

The worldwide market is approximately 3.0 bHHon in sales, with the pediatric portion accounting for about 35%. Basic, required childhood vaccines (DTP, poHo, measles /MMR, BCG, and TT) account for 3640 x 10 doses of this global market. In the United States doses distributed in the pediatric sector have risen from around 45 x 10 in 1982, covering basic, childhood vaccines, to around 75 x 10 in 1993 due primarily to the addition of vaccines for Haemophilus disease, hepatitis B, and a second dose of MMR to the recommended childhood series (144). The majority of vaccines for the U.S. market are... 

Tuberculocidal Test. The tubercle bacillus is resistant to disinfectants because the cells are protected with a waxy coating that is not readily penetrated. The tuberculocidal test is a use dilution practical type test that employs porcelain cylinders. The bacteria are different from those in the use dilution method (Table 10), the incubation time is longer, and the details of the procedure are different. For example, in the tuberculocidal test the test is divided into two parts, a presumptive test and a confirmatory test. The former employs Mycobacterium smegmatis and the latter employs Mycobacterium bovis (BCG). For the presumptive test the incubation time is 12 days, as against 48 hours for other bacteria used in the use-dilution method. For the confirmatory test the incubation time is 60 days, with an additional 30 days in case there is no growth. As shown in Table 10, the concentrations of the phenol standard are higher than used with other bacteria. 

Dead or live bacteria may be effective to stimulate inflammatory reactions of phagocytic cells against tumor cells. The best-characterized treatment is the use of Bacillus Calmette Guerin (BCG) in the case of bladder cancer where activation of the immune response is capable of controlling tumor growth. 

Selective active immunization against mumps Same as for BCG vaccine 0.5 ml. 9C (total volume of reconstituted vaccine)... 

Active immunization against Same as for BCG vaccine 0.5 mLSC... 

Active immunizations for the poliovirus Same as for BCG vaccine Three doses of 0.5 mL SC at 2 months, 4 months, and 12-15 months chidren receive a booster dose before entering school... 

Active immunization against the specific influenza virus strains contained in the formulation Same as for BCG vaccine One or two doses of 0.25-0.5 mL IM... 

For active immunization against Japanese encephalitis for individuals older than 1 year Same as for BCG vaccine Three doses given to adults and children > 3 years 1 mLSC on days 0, 7, and 30 children 1-3 years 0.5 mLSC on days 0, 7, and 30... 

BCG Cultures of live BCG cells in liquid or on solid media 1 Bacteria centrifuged from medium 2 Resuspension in stabilizer 3 Freeze-drying Viable count induction of sensitivity to tuberculin in guinea-pigs Exclusion of virulent mycobacteria absence of excessive dermal reactivity... 

Because of the risks of adverse reaction to the vaccine by persons who had already been exposed to the disease a sensitivity test must be carried out prior to immunization with BCG. A Mantoux skin test assesses an individual s sensitivity to a purified protein derivative (PPD) prepared fi om heat-treated antigens (tuberculin) extracted fiom M tuberculosis. A positive test imphes past infection or past, successful immunization Those with strongly positive tests may have active disease and should be referred to a chest clinic. Many people with active TB, especially disseminated TB, however, sero-convert fiom skin test positive to skin test negative. Results of the skin test must therefore be interpreted with care. 

BCF Basophil chemotactic factor B-CFC Basophil colony-forming cell BCG Bacillus Calmette-Guerin BCNU l,3-bis(2-chloroethyl)-l-nitrosourea bFGF Basic fibroblast growth fiictor Bg Birbeck granules BHR Bronchial hyperresponsiveness BHT Butylated hydroxyroluene b.i.d. Bis in die (twice a day)... 

Bacille Calmette-Guerin (BCG) A vaccine prepared from a living attenuated strain of tubercle bacilli and used to vaccinate human beings against tuberculosis or treat some types of cancer. 

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