Which routes of transmission are most relevant for Category A agents?

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Category A agents pose the greatest threat because they can spread widely and cause severe illness or death. The transmission routes that matter most for these agents include airborne spread and transmission via contact with contaminated surfaces or mucous membranes, since these pathways enable rapid spread to many people. Ingestion is also a consideration for some agents, such as toxins or organisms that contaminate food or water. So the most comprehensive and accurate description is that these agents can spread through airborne and contact routes, with ingestion being relevant for certain agents. Vector-borne transmission is not the primary concern for most Category A agents, making vector-borne only an incomplete description.