{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"medRxiv"}],"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T21:23:08Z","timestamp":1775251388358,"version":"3.50.1"},"posted":{"date-parts":[[2024,6,13]]},"group-title":"Infectious Diseases (except HIV\/AIDS)","reference-count":99,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2024,6,13]],"date-time":"2024-06-13T00:00:00Z","timestamp":1718236800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2024,8,16]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>In 2023, cholera affected approximately 1 million people and caused more than 5000 deaths globally, predominantly in low-income and conflict settings. In recent years, the number of new cholera outbreaks has grown rapidly. Further, ongoing cholera outbreaks have been exacerbated by conflict, climate change, and poor infrastructure, resulting in prolonged crises. As a result, the demand for treatment and intervention is quickly outpacing existing resource availability. Prior to improved water and sanitation systems, cholera, a disease primarily transmitted via contaminated water sources, also routinely ravaged high-income countries. Crumbling infrastructure and climate change are now putting new locations at risk \u2014 even in high-income countries. Thus, understanding the transmission and prevention of cholera is critical.<\/jats:p>\n                <jats:p>Combating cholera requires multiple interventions, the two most common being behavioral education and water treatment. Two-dose oral cholera vaccination (OCV) is often used as a complement to these interventions. Due to limited supply, countries have recently switched to single-dose vaccines (OCV1). One challenge lies in understanding where to allocate OCV1 in a timely manner, especially in settings lacking well-resourced public health surveillance systems. As cholera occurs and propagates in such locations, timely, accurate, and openly accessible outbreak data are typically inaccessible for disease modeling and subsequent decision-making.<\/jats:p>\n                <jats:p>\n                  In this study, we demonstrated the value of open-access data to rapidly estimate cholera transmission and vaccine effectiveness. Specifically, we obtained non-machine readable (NMR) epidemic curves for recent cholera outbreaks in two countries, Haiti and Cameroon, from figures published in situation and disease outbreak news reports. We used computational digitization techniques to derive weekly counts of cholera cases, resulting in nominal differences when compared against the reported cumulative case counts (i.e., a relative error rate of 5.67% in Haiti and 0.54% in Cameroon). Given these digitized time series, we leveraged EpiEstim\u2014an open-source modeling platform\u2014to derive rapid estimates of time-varying disease transmission via the effective reproduction number (\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>t<\/jats:italic>\n                  <\/jats:sub>\n                  ). To compare OCV1 effectiveness in the two considered countries, we additionally used VaxEstim, a recent extension of EpiEstim that facilitates the estimation of vaccine effectiveness via the relation among three inputs: the basic reproduction number (\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>0<\/jats:italic>\n                  <\/jats:sub>\n                  ),\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>t<\/jats:italic>\n                  <\/jats:sub>\n                  , and vaccine coverage. Here, with Haiti and Cameroon as case studies, we demonstrated the first implementation of VaxEstim in low-resource settings. Importantly, we are the first to use VaxEstim with digitized data rather than traditional epidemic surveillance data.\n                <\/jats:p>\n                <jats:p>\n                  In the initial phase of the outbreak, weekly rolling average estimates of\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>t<\/jats:italic>\n                  <\/jats:sub>\n                  were elevated in both countries: 2.60 in Haiti [95% credible interval: 2.42-2.79] and 1.90 in Cameroon [1.14-2.95]. These values are largely consistent with previous estimates of\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>0<\/jats:italic>\n                  <\/jats:sub>\n                  in Haiti, where average values have ranged from 1.06 to 3.72, and in Cameroon, where average values have ranged from 1.10 to 3.50. In both Haiti and Cameroon, this initial period of high transmission preceded a longer period during which\n                  <jats:italic>R<\/jats:italic>\n                  <jats:sub>\n                    <jats:italic>t<\/jats:italic>\n                  <\/jats:sub>\n                  oscillated around the critical threshold of 1. Our results derived from VaxEstim suggest that Haiti had higher OCV1 effectiveness than Cameroon (75.32% effective [54.00-86.39%] vs. 54.88% [18.94-84.90%]). These estimates of OCV1 effectiveness are generally aligned with those derived from field studies conducted in other countries. Thus, our case study reinforces the validity of VaxEstim as an alternative to costly, time-consuming field studies of OCV1 effectiveness. Indeed, prior work in South Sudan, Bangladesh, and the Democratic\n                <\/jats:p>\n                <jats:p>Republic of the Congo reported OCV1 effectiveness ranging from approximately 40% to 80%.<\/jats:p>\n                <jats:p>This work underscores the value of combining NMR sources of outbreak case data with computational techniques and the utility of VaxEstim for rapid, inexpensive estimation of vaccine effectiveness in data-poor outbreak settings.<\/jats:p>","DOI":"10.1101\/2024.06.12.24308792","type":"posted-content","created":{"date-parts":[[2024,6,13]],"date-time":"2024-06-13T10:10:49Z","timestamp":1718273449000},"source":"Crossref","is-referenced-by-count":1,"title":["Estimating time-varying cholera transmission and oral cholera vaccine effectiveness in Haiti and Cameroon, 2021-2023"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0525-1856","authenticated-orcid":false,"given":"Erin N.","family":"Hulland","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marie-Laure","family":"Charpignon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ghinwa Y.","family":"El Hayek","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5985-0614","authenticated-orcid":false,"given":"Lihong","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angel N.","family":"Desai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maimuna S.","family":"Majumder","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"54368","reference":[{"key":"2024081907300416000_2024.06.12.24308792v2.1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(12)60436-X"},{"key":"2024081907300416000_2024.06.12.24308792v2.2","unstructured":"World Health Organization. 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