{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,11]],"date-time":"2026-10-11T15:06:33Z","timestamp":1791731193317,"version":"4.3.4"},"reference-count":38,"publisher":"American Society for Microbiology","issue":"6","license":[{"start":{"date-parts":[[2010,6,1]],"date-time":"2010-06-01T00:00:00Z","timestamp":1275350400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Clin Vaccine Immunol"],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n          <jats:p>\n            We previously reported that ethanol-killed cells of a noncapsulated strain of\n            <jats:italic>Streptococcus pneumoniae<\/jats:italic>\n            , given intranasally with cholera toxin as an adjuvant, protect rats against pneumonia and mice against colonization of the nasopharynx and middle ear by capsulated pneumococci of various serotypes. The acceleration of pneumococcal clearance from the nasopharynx in mice is CD4\n            <jats:sup>+<\/jats:sup>\n            T cell-dependent and interleukin 17A (IL-17A) mediated and can be antibody independent. Here, anticipating human studies, we have demonstrated protection with a new vaccine strain expressing a nonhemolytic derivative of pneumolysin and grown in bovine-free culture medium. Killing the cells with chloroform, trichloroethylene, or beta-propiolactone\u2014all used without postinactivation washing\u2014produced more-potent immunogens than ethanol, and retention of soluble components released from the cells contributed to protection. Two sequential intranasal administrations of as little as 1 \u03bcg of protein (total of cellular and soluble combined) protected mice against nasopharyngeal challenge with pneumococci. Nontoxic single and double mutants of\n            <jats:italic>Escherichia coli<\/jats:italic>\n            heat-labile toxin were effective as mucosal adjuvants. Protection was induced by the sublingual and buccal routes, albeit requiring larger doses than when given intranasally. Protection was likewise induced transdermally with sonicates of the killed-cell preparation. Thus, this whole-cell antigen can be made and administered in a variety of ways to suit the manufacturer and the vaccination program and is potentially a solution to the need for a low-cost vaccine to reduce the burden of childhood pneumococcal disease in low-income countries.\n          <\/jats:p>","DOI":"10.1128\/cvi.00036-10","type":"journal-article","created":{"date-parts":[[2010,4,29]],"date-time":"2010-04-29T03:01:32Z","timestamp":1272510092000},"page":"1005-1012","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":93,"title":["Options for Inactivation, Adjuvant, and Route of Topical Administration of a Killed, Unencapsulated Pneumococcal Whole-Cell Vaccine"],"prefix":"10.1128","volume":"17","author":[{"given":"Ying-Jie","family":"Lu","sequence":"first","affiliation":[{"name":"Divisions of Infectious Diseases, Department of Medicine, Children's Hospital, and Harvard Medical School, Boston, 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