Typhoid Mary's attitude is similar to the attitude of many unbelievers...
In the early 1900's an Irish cook gained notoriety for spreading Typoid Fever wherever she worked.
Because she appeared healthy, Typhoid Mary refused to believe she was a carrier. Ignoring strong warnings by the NY Board of Health, she continued to cook under alias names.
The antibiotics that now cure Typhoid Fever weren't available, and Mary ended up causing repeated outbreaks and several deaths. Eventually, she was caught and forced into permanent quarantine for the remaining 23 years of her life.
This true story is a good analogy for the deathly human disease called unbelief. Like Mary, we can stubbornly refuse to believe we're carriers and misunderstand our symptoms. But we have no excuse for not taking the cure:
"He Himself bore our sins in His body on the cross, so that we might die to sin and live to righteousness; for by His wounds you were healed."
1 Peter 2:24 NASB
I'm rejoicing today that because of Christ, I'm no longer a carrier. Will you rejoice with me?
Source: Typhoid Mary