Mary Baker Eddy wrote an insightful article on how to protect oneself from contagious disease in her piece, “Contagion,” included in her book Miscellaneous Writings.
“Whatever man sees, feels, or in any way takes cognizance of, must be caught through mind; inasmuch as perception, sensation, and consciousness belong to mind and not to matter. Floating with the popular current of mortal thought without questioning the reliability of its conclusions, we do what others do, believe what others believe, and say what others say. Common consent is contagious, and it makes disease catching” Miscellaneous Writings, p. 228.
These are certainly wise words to keep us awake to the importance of watching the direction of our thought and not letting it fall into accepting the possibility of catching a contagious disease. Disease is caught through mind, not the body, so if successfully kept out of thought, the body is protected.
By knowing the omnipresence of God, in which there is only the goodness of God circulating for one and all to feel and know, we can neutralize fear of disease and render it harmless. Mrs. Eddy gives us the ultimate immunity from contagion in these words,
“A calm, Christian state of mind is a better preventive of contagion than a drug, or than any other possible sanative method; and the “perfect Love” that “casteth out fear” is a sure defense”
Miscellaneous Writings, p. 229.