{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T16:14:27Z","timestamp":1785428067800,"version":"3.56.0"},"reference-count":63,"publisher":"American Society for Microbiology","issue":"9","license":[{"start":{"date-parts":[[2025,9,9]],"date-time":"2025-09-09T00:00:00Z","timestamp":1757376000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,9,9]],"date-time":"2025-09-09T00:00:00Z","timestamp":1757376000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01 AI171971"],"award-info":[{"award-number":["R01 AI171971"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Infect Immun"],"published-print":{"date-parts":[[2025,9,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title\/>\n                    <jats:p>\n                      <jats:italic toggle=\"yes\">Leishmania infantum<\/jats:italic>\n                      causes human visceral leishmaniasis and leishmaniosis (CanL) in reservoir host, dogs. As infection progresses to disease in both humans and dogs, there is a shift from controlling type 1 immunity to a regulatory, exhausted T cell phenotype. In endemic areas, the association between tick-borne coinfections (TBCs) and\n                      <jats:italic toggle=\"yes\">Leishmania<\/jats:italic>\n                      diagnosis and\/or clinical severity has been demonstrated. To identify immune factors correlating with disease progression, we prospectively evaluated a cohort of\n                      <jats:italic toggle=\"yes\">L. infantum<\/jats:italic>\n                      -infected dogs from 2019 to 2022. The cohort was TBC-negative with asymptomatic leishmaniosis at the time of enrollment. We measured TBC serology, anti-\n                      <jats:italic toggle=\"yes\">Leishmania<\/jats:italic>\n                      antigen T cell immunity, CanL serological response, parasitemia, and disease severity to probe how nascent TBC perturbs the immune state. At the conclusion, TBC+ dogs with CanL experienced greater increases in anti-\n                      <jats:italic toggle=\"yes\">Leishmania<\/jats:italic>\n                      antibody reactivity and parasite burden compared to dogs that did not have incident TBC during the study. TBC+ dogs were twice as likely to experience moderate (LeishVet stage 2) or severe\/terminal disease (LeishVet stage 3\/4). Prolonged exposure to TBC was associated with a shift in\n                      <jats:italic toggle=\"yes\">Leishmania<\/jats:italic>\n                      antigen-induced interferon gamma (IFN-\u03b3)\/interleukin-10 (IL-10) and enhanced CD8 T cell proliferation. Frequency of proliferating CD8 T cells significantly correlated with parasitemia and antibody reactivity. TBC exacerbated parasite burden and immune exhaustion. These findings highlight the need for combined vector control efforts as prevention programs for dogs in\n                      <jats:italic toggle=\"yes\">Leishmania<\/jats:italic>\n                      endemic areas to reduce transmission to humans. Public health education efforts should aim to increase awareness of the connection between TBC and leishmaniosis.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/iai.00182-25","type":"journal-article","created":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T12:04:26Z","timestamp":1753963466000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Tick-borne coinfections modulate CD8\n                    <sup>+<\/sup>\n                    T cell response and progressive leishmaniosis"],"prefix":"10.1128","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3489-0270","authenticated-orcid":false,"given":"Breanna M.","family":"Scorza","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/036jqmy94","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Epidemiology, University of Iowa","place":["Iowa City, 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