Final answer:
There is no specific data on the number of healthcare personnel infected with HBV, but vaccination has reduced infection rates among healthcare workers.
Step-by-step explanation:
According to the information provided, there is no specific data on the exact number of healthcare personnel infected with blood-borne pathogens, specifically HBV. However, it is mentioned that hepatitis B was once a leading on-the-job hazard for healthcare workers, and rates of infection have declined since the CDC recommended vaccination against HBV in 1982. Vaccination is not always effective, and there is still a small risk of infection, especially for healthcare workers working with individuals who have chronic HBV.