Which agent’s post-exposure management relies primarily on vaccination rather than antibiotic prophylaxis?

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Vaccination after exposure can be the main defense when a viral agent is involved and an effective post-exposure vaccine exists. Smallpox is caused by variola virus, for which there is no reliable post-exposure antiviral treatment. The vaccinia-based smallpox vaccine, given promptly after exposure, can trigger an immune response quickly enough to prevent disease or significantly lessen its severity. The benefit is greatest if the vaccine is given within a few days of exposure (typically within 3–4 days, with some benefit up to about a week).

In contrast, the other agents listed are bacterial diseases for which post-exposure care relies on antibiotic prophylaxis and treatment rather than vaccination. Vaccines may exist or be used in other contexts, but they are not the primary immediate post-exposure strategy for these pathogens.