<h3>Emotions: A strong feeling deriving from one's circumstances, mood, or relationships with others.</h3>
<h3>Being Emotional: When you're emotional, you're feeling lots of feelings, or emotions: happy, sad, afraid, lonely, mad. An emotional speech makes you stand up and cheer. An emotional movie tugs on your heartstrings.</h3>
<h2>Hope it helps you </h2>
Answer:
I didn't read the book or know the story but I can imagine that if it is meant to be literal, he/she said it because having the disease made him/her more careful and weary.
Explanation:
It is kind of like what happened with this Corona. We heard about the "disease" and became more weary and careful. Also: sharpened our senses.