The child who initially tested positive for HIV, is now negative after a confirmatory test
That’s why they always follow the initial HIV test with a confirmatory Western Blot test. The specificity of an initial HIV serology is 99.7% (i.e. 0.3% chance of a false positive). It is because of that small chance of false positive that a confirmatory test is needed.
The frequency of a true false positive (i.e. positive serology and Western Blot in a patient without HIV) is 0.0006 to 0.0007 percent.
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