A tuberculin skin test must be given at least how often after employment?

The correct answer is that a tuberculin skin test must be given at least annually after employment. This requirement is grounded in public health guidelines aimed at preventing the spread of tuberculosis, particularly in high-risk environments like healthcare facilities where exposure is more likely. Annual testing is recommended to ensure early detection of tuberculosis infection, allowing for timely treatment and minimizing risk to both employees and patients.

Regular testing helps to monitor the health of employees who may be exposed to infectious agents. This frequency is aligned with recommendations from health authorities, ensuring that those who may come into contact with tuberculosis are regularly assessed for infection. In contrast, options suggesting semi-annual, every two years, or monthly testing do not conform to these established guidelines and would likely either overwhelm the system or miss timely identification of exposure risks.