There is an expectation for psychological casualties after chemical or biological attack; which ratio is most likely?

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When a chemical or biological attack is possible, fear and uncertainty spread far beyond those who are physically harmed. The threat is often invisible, symptoms can appear later, and people worry about exposure to loved ones, disruption of daily life, and potential long-term health effects. This leads to widespread acute stress reactions, anxiety, insomnia, and other psychological responses in both those exposed and the general population. Because mental health impacts can occur without any physical injury and can affect many more people than those who are wounded, the most likely pattern is that there will be more psychological casualties per person who is actually wounded. The other options underestimate the scale of psychological impact in these scenarios.