{"doi":"10.1371/journal.pone.0254563","title":"Sero-surveillance for SARS-CoV-2 infection among healthcare providers in four hospitals in Thailand one year after the first community outbreak","abstract":"BACKGROUND: Thailand was the first country outside China to report SARS-CoV-2 infected cases. Since the detection of the first imported case on January 12th, 2020 to the time this report was written, Thailand experienced two waves of community outbreaks (March-April 2020 and December 2020-March 2021). We examined prevalence of SARS-CoV-2 seropositivity among healthcare providers (HCPs) in four hospitals approximately one year after SARS-CoV-2 first detected in Thailand. By March 2021, these hospitals have treated a total of 709 coronavirus disease 2019 (COVID-19) patients. METHODS: Blood specimens, collected from COVID-19 unvaccinated HCPs during January-March 2021, were tested for the presence of SARS-CoV-2 immunoglobulin G (IgG) antibodies to nucleocapsid (IgG-nucleocapsid) and spike (IgG-spike) proteins using Euroimmune® enzyme-linked immunosorbent assays. RESULTS: Of 600 HCPs enrolled, 1 (0.2%) tested positive for the SARS-CoV-2 IgG-spike antibodies, but not the IgG-nucleocapsid. CONCLUSION: The presence of SARS-CoV-2 IgG antibodies was rare in this sample of HCPs, suggesting that this population remains susceptible to SARS-CoV-2 infection.","journal":"PLoS ONE","year":2021,"id":194048,"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":10,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9374,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2021-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":763210,"name":"Phunlerd Piyaraj","orcid":"0000-0003-0166-7336","position":1,"is_corresponding":false},{"id":763851,"name":"Apichat Vachiraphan","orcid":null,"position":2,"is_corresponding":false},{"id":763852,"name":"Thanapat Wongrapee","orcid":null,"position":3,"is_corresponding":false},{"id":763211,"name":"Somsak Punjasamanvong","orcid":"0000-0001-6827-249X","position":4,"is_corresponding":false},{"id":656864,"name":"Taweewun Hunsawong","orcid":"0000-0002-0330-6334","position":5,"is_corresponding":false},{"id":287195,"name":"Chalinthorn Sinthuwattanawibool","orcid":null,"position":6,"is_corresponding":false},{"id":763212,"name":"Chaniya Leepiyasakulchai","orcid":"0000-0002-2390-3048","position":7,"is_corresponding":false},{"id":763853,"name":"Pornsak Yoocharoen","orcid":null,"position":8,"is_corresponding":false},{"id":7186,"name":"Eduardo Azziz‐Baumgartner","orcid":"0000-0001-8038-0530","position":9,"is_corresponding":false},{"id":285561,"name":"Joshua A. Mott","orcid":"0000-0001-6474-8390","position":10,"is_corresponding":false},{"id":725483,"name":"Suthat Chottanapund","orcid":"0000-0001-6630-4339","position":11,"is_corresponding":false},{"id":285554,"name":"Wanitchaya Kittikraisak","orcid":"0000-0002-2295-4388","position":0,"is_corresponding":true}],"reference_count":20,"raw_metadata":null,"created_at":"2026-07-18T23:49:55.282992Z","pmid":"34260638","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":[]}