Like the Invisible Man, viruses can't be seen—yet they can kill, and handwashing alone won't stop every infection. This tract makes the case that your best defense is a strong immune system, and gives practical ways to boost it with antioxidant-rich plant foods, build it with exercise, balance it with stress management, and trust the invisible Helper who sustains us in sickness (Psalm 41:3). Share it to bring calm, practical help in anxious times.