{"doi":"10.1002/jia2.26491","title":"HIV‐1 testing in the context of expanding PrEP modalities","abstract":"INTRODUCTION: Multiple effective antiretroviral-based pre-exposure prophylaxis (PrEP) modalities for HIV-1 prevention are now available or under investigation but their safe rollout requires implementable HIV-1 testing strategies that accurately identify rare cases of HIV-1 acquisition. Current PrEP testing guidelines and testing algorithms in PrEP studies are varied, using single or combinations of rapid antibody-based diagnostic testing, qualitative or quantitative nucleic acid testing, and/or sample collection for retrospective analyses with sensitive research assays for HIV-1 nucleic acid detection. The objective of this commentary is to summarize current and alternative HIV testing approaches for PrEP implementation to guide best practices for individual programmes. DISCUSSION: Diagnosing HIV-1 in PrEP users is challenging because (1) rarity of breakthrough HIV-1 in individuals on PrEP that increases the risk of a false-positive test; (2) modification of acute HIV infection by PrEP; and (3) PrEP delivery in community settings with inadequate testing infrastructure. Current best practices indicate the use of rapid diagnostic tests or self-testing as recommended by national testing algorithms and the World Health Organization (WHO). The use of nucleic acid testing such as plasma HIV-1 RNA polymerase chain reaction may allow earlier detection of HIV-1 but feasibility and risk of false positive are downsides. Sensitive tests to detect single-copy HIV-1 RNA in plasma and integrated proviral DNA in blood mononuclear cells may be important methods to resolve ambiguous HIV-1 diagnosis in research settings. Delayed diagnoses could lead to drug resistance emergence under long-acting PrEP selection, whereas single unconfirmed false-positive tests could create diagnostic challenges in users of long-acting PrEP. The cost, feasibility and positive predictive value of HIV tests are important considerations for PrEP programmes. CONCLUSIONS: Optimal strategies to detect HIV-1 acquisition among users of different PrEP modalities are evolving. While new guidance from the WHO recommends HIV-1 testing by serological assays or self-testing with PrEP use, feasible plans for clinical management of rare cases of breakthrough on PrEP and ambiguous diagnoses are still needed. The data from PrEP studies and scale-up will help us assess the value of different tests and testing approaches for their inclusion in HIV detection algorithms across PrEP modalities.","journal":"Journal of the International AIDS Society","year":2025,"id":519807,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":6,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9564,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2025-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":258958,"name":"Jana L. Jacobs","orcid":"0000-0002-0322-585X","position":1,"is_corresponding":false},{"id":963368,"name":"Njambi Njuguna","orcid":"0000-0002-0969-3849","position":2,"is_corresponding":false},{"id":634593,"name":"Kristine Torjesen","orcid":"0000-0002-3439-1199","position":3,"is_corresponding":false},{"id":258969,"name":"John W. Mellors","orcid":"0000-0002-3737-9742","position":4,"is_corresponding":false},{"id":629745,"name":"Urvi M. Parikh","orcid":"0000-0002-4016-0629","position":0,"is_corresponding":true}],"reference_count":45,"raw_metadata":null,"created_at":"2026-07-19T02:49:23.618703Z","pmid":"40600472","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}