Final answer:
The MMR vaccine provides immunity against measles, mumps, and rubella, with the MMR titer assessing immunity levels, especially important in healthcare settings. The DTaP vaccine is used to prevent diphtheria, tetanus, and pertussis in children, with booster doses throughout life. The BCG vaccine affects the reliability of the TST for detecting tuberculosis in populations where BCG is used.
Step-by-step explanation:
The MMR vaccine is a critical immunization that protects against measles, mumps, and rubella. Healthcare workers, who are at high risk of exposure and transmission, often require an MMR titer to confirm immunity, and may need revaccination based on its results. Furthermore, the tuberculin skin test (TST), used to screen for tuberculosis, can yield false-positive results in individuals vaccinated with the BCG vaccine. In such cases, chest radiographs are needed to confirm exposure. Multiple vaccines are available to prevent diseases like diphtheria and pertussis. The DTaP vaccine is recommended for children to build immunity against diphtheria, tetanus, and acellular pertussis, while adults should receive the Td booster every 10 years. The Bacillus Calmette-Guérin (BCG) vaccine can complicate TST results in areas where it is commonly used, as previous recipients of BCG will likely test positive.