Final answer:
Chemoprophylaxis for Bordetella pertussis is recommended for high-risk individuals and those in close contact with them, such as infants, pregnant women, and those with certain health conditions.
Step-by-step explanation:
Individuals who should receive chemoprophylaxis for Bordetella pertussis, the bacterium causing whooping cough, include those who are at high risk of severe illness and complications from pertussis and those who have close contact with individuals at high risk. This particularly pertains to infants under 12 months, pregnant women in their third trimester, and those with pre-existing health conditions that may be exacerbated by a pertussis infection. High-risk individuals, their household contacts, and those with close contact (such as healthcare workers) typically receive chemoprophylaxis with antibiotics like azithromycin, clarithromycin, or erythromycin to prevent the spread of the infection.