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Mostly, such infections are symptomless and individual worm burdens are low. Blackwell\n            <jats:italic>et al.<\/jats:italic>\n            monitored the fecundity of Tsimane women in Bolivia. These women have on average of 10 children in their lifetimes. However, if they had successive hookworm infections, lifetime births dropped to 7. Surprisingly, if the women were chronically infested with roundworm, they had as many as 12 children. These effects may relate to the balance of immune responses that the different worms induce, rather than to the physiological costs of parasitism.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Science<\/jats:italic>\n            , this issue p.\n            <jats:related-article xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"doi\" issue=\"6263\" page=\"970\" related-article-type=\"in-this-issue\" vol=\"350\" xlink:href=\"10.1126\/science.aac7902\">970<\/jats:related-article>\n          <\/jats:p>","DOI":"10.1126\/science.aac7902","type":"journal-article","created":{"date-parts":[[2015,11,19]],"date-time":"2015-11-19T19:23:39Z","timestamp":1447961019000},"page":"970-972","source":"Crossref","is-referenced-by-count":103,"title":["Helminth infection, fecundity, and age of first pregnancy in women"],"prefix":"10.1126","volume":"350","author":[{"given":"Aaron D.","family":"Blackwell","sequence":"first","affiliation":[{"name":"Department of Anthropology, University of California Santa Barbara, CA 93106, USA."},{"name":"Tsimane Health and Life History Project, San Borja, Bolivia."},{"name":"Broom Center for Demography, University of California Santa Barbara, CA 93106, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marilyne A.","family":"Tamayo","sequence":"additional","affiliation":[{"name":"Department of Anthropology, University of Missouri, Columbia, MO 65211, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bret","family":"Beheim","sequence":"additional","affiliation":[{"name":"Tsimane Health and Life History Project, San Borja, Bolivia."},{"name":"Department of Anthropology, University of New Mexico, Albuquerque, NM 87131, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin C.","family":"Trumble","sequence":"additional","affiliation":[{"name":"Department of Anthropology, University of California Santa Barbara, CA 93106, USA."},{"name":"Tsimane 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