I have never had hepatitis B, but the results of five tests of hepatitis B are different.

Philosophical truth is sometimes useful. "Motion is absolute, and stillness is relative". The result of a test is like taking a static picture of a dynamic process. It's just that you took two pictures and found that the results were different. There are 365 days in a year, but the probability of your blood test is five thousandths (two divided by 365). In other words, 99.95% of the 365 days in a year are not under strict monitoring. If the fifth item is positive in 1978, it is impossible to know that it is positive because you have not tested this item before. However, these two tests were just at the end of the negative period. The first test was positive, but after two days, the results turned negative. Medicine is so simple, just like a fortune teller. Naturally, many fortune tellers are completely collecting money. What do you think of appearances?