In a biological attack, which of the following is a common agent of concern?

The presence of Anthrax as a common agent of concern in a biological attack is rooted in its characteristics and potential effects on public health. Anthrax, caused by the bacterium Bacillus anthracis, can be weaponized and disseminated through aerosolized spores, making it particularly dangerous in a mass-casualty event. Its ability to remain viable in the environment for long periods and the serious health implications of inhalational, cutaneous, and gastrointestinal forms of the disease contribute to its notoriety as a biological agent.

In contrast, chlorine gas is associated with chemical attacks rather than biological ones, as it is a toxic industrial chemical. Smoke, while harmful in instances such as fires or explosions, is not classified under biological agents. Radiation pertains to nuclear threats and does not fall under the biological category either. This distinction emphasizes why Anthrax is recognized specifically as a biological threat, highlighting its relevance in scenarios involving pathogens intended to inflict harm on human populations.