Leptospirosis Clinical Trial
Official title:
Seroprevalence, Multi-center, Phase IV Cross-sectional Study to Evaluate the Persistence of Anti-leptospira Antibody in Subjects Vaccinated With Spirolept® Vaccine
The study aims to assess antibody persistence induced by Spirolept® vaccination in subjects who received at least 4 doses (2 doses two weeks apart and 2 booster doses) and no more than a total of 8 doses (2 doses two weeks apart and 6 booster doses).
This is a seroprevalence, phase IV, multi -center study to evaluate anti-Leptospira antibody
persistence in subjects who have received at least the 2nd booster (4 vaccine doses) and no
more than the 6th booster (8 vaccine doses) of Spirolept® vaccine.
The study will be conducted at the Occupational Health Centre of companies employing workers
at risk of leptospirosis for their occupational activities. Study participants will be
selected from the company Occupational Health Centre database where each employee is
registered. All workers are regularly followed-up and their medical and vaccination history
recorded. Subjects selection will occur according the number of booster doses received
(having received at least the 2nd booster and no more than the 6th booster). After they have
signed the informed consent form, subjects will be recruited into the study and if all
inclusion and exclusion criteria are met they will be taken a blood sample.
Anti-leptospira IgG antibody will be measured by a validated ELISA. Other assay may be
performed to further characterize anti-leptospira antibodies. Data on subject demographics,
relevant medical history, vaccination dates, and blood collection will be recorded in an
appropriate Case Report Form.
The study does not include any vaccination.
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