Delays in dissemination and implementation of testing have been a feature of the response to novel viruses, even prior to the advent of COVID-19. There are now five generations of HIV assays, which have progressively reduced the test-negative window.

Publication reference : Alexander TS. HIV Diagnostic Testing: 30 Years of Evolution
Reference URL: https://journals.asm.org/doi/10.1128/CVI.00053-16