What is the schedule for the Anthrax vaccine?

The schedule for the Anthrax vaccine is structured to ensure effective immunity against the disease. The correct answer outlines a multi-dose regimen that begins with an initial dose on Day 0, followed by additional doses at strategic intervals to build and sustain an adequate immune response.

Specifically, the schedule begins with the first dose on Day 0, followed by doses at 4 weeks (approximately 30 days), then at 6, 12, and finally at 18 months. This comprehensive vaccination schedule is essential as it allows the body to develop and strengthen its immune response over time, which is particularly important given how anthrax can present as a serious and potentially life-threatening infection.

This multi-dose strategy ensures that the vaccine generates a robust and longer-lasting immunity, which is crucial for populations at risk, such as military personnel. The vaccine's effectiveness hinges on compliance with this schedule to ensure that immunity is properly established and maintained against exposure to anthrax spores.

In contrast, other options either suggest insufficient dosing intervals or a single dose, which does not align with the established recommendations for anthrax vaccination.