Cholera Clinical Trial
Official title:
Effectiveness of a Bivalent, Killed Whole-cell Based Oral Cholera Vaccine(Shanchol®) Delivered Through Community-based Mass Vaccination Campaign in a High-risk Population in India: Matched Case-control Studies
Various field studies has found that the modified , bivalent, whole cell - based oral cholera vaccine (OCV) to be safe, immunogenic and effective with protective efficacy of 67 % in earlier clinical trials. However, the effectiveness of the vaccine in "real" life situation using the public health system is unknown. It is critical to follow up in the same population, where pilot introduction of OCV was introduced and evaluate vaccine proactive effectiveness at individual as well as at population level. The follow - up and determination of effectiveness of mass OCV vaccination was requested by State Government.
The overall goal of this study is to evaluate the protective effectiveness of one or two
doses of modified, bivalent, killed whole cell based OCV, given at least 14 days apart, when
delivered through community - based mass vaccination campaign using existing public health
infrastructure in a high - risk population in Satyabadi block of Puri district, Orissa,
India.
This study has following objectives
Primary objectives:
* To evaluate the individual level protective effectiveness of one or two doses of OCV
against culture confirmed cholera episodes, severe enough to seek a formal health care.
Secondary objectives:
- To evaluate population - level effectiveness (herd effects)of OCV delivered through a
community based mass vaccination when the vaccine is delivered to more than half of
population at risk.
- To determine inverse correlation between vaccine coverage and cholera incidence among
diverse geographical clusters.
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