Image_1_Biannual and Quarterly Comparison Analysis of Agglutinating Antibody Kinetics on a Subcohort of Individuals Exposed to Leptospira interrogans in Salvador, Brazil.JPEG
Leptospirosis is a zoonosis with a worldwide spread that leads to clinical manifestations ranging from asymptomatic infection to a life-threatening disease. The immune response is predominantly humoral mediated limited to the infecting serovar. Individuals living in an area endemic for leptospirosis are often exposed to an environment contaminated with leptospires and there is a paucity of information on naturally acquired immunity. In the present study, we evaluated the kinetics of agglutinating antibodies in individuals from an endemic area for leptospirosis in Salvador, Brazil comparing two different intersample collection times.
MethodsBetween 2017–2018, we carried out a biannual prospective cohort with 2,086 individuals living in an endemic area for leptospirosis in Salvador, Brazil. To compare agglutinating antibody kinetics using microscopic agglutination test (MAT) with different collection times, a subcohort of 72 individuals with quarterly follow-up was carried out in parallel.
ResultsThe results revealed that using a shorter time for intersample collection led to the detection of a higher number of infections and reinfection events. Furthermore, we observed a higher rate of titer decay indicating partial and short protection. However, there was no indication of major changes in risk factors for the disease.
ConclusionsWe evaluated antibody kinetics among residents of an endemic area for leptospirosis comparing two sample collection times. The constant exposure to the contaminated environment increases the risk for leptospirosis infection with reinfection events being more common than expected. This indicates that the burden of leptospirosis might be underestimated by serological surveys, and further studies are necessary to better characterize the humoral response after infection.
History
Usage metrics
Categories
- Radiology and Organ Imaging
- Foetal Development and Medicine
- Obstetrics and Gynaecology
- Primary Health Care
- Medical and Health Sciences not elsewhere classified
- Dermatology
- Emergency Medicine
- Gastroenterology and Hepatology
- Geriatrics and Gerontology
- Intensive Care
- Medical Genetics (excl. Cancer Genetics)
- Nephrology and Urology
- Nuclear Medicine
- Orthopaedics
- Otorhinolaryngology
- Pathology (excl. Oral Pathology)
- Family Care