Zoonotic Semiotics: Plague Narratives and Vanishing Signs in Madagascar

Area of Science:

• Ecology and Evolutionary Biology
• Epidemiology
• Medical Anthropology

Background:

• Zoonotic diseases like bubonic plague require understanding disease transmission across species.
• In Madagascar, rat mortality is a key indicator for plague outbreaks, but this early warning system is often ineffective.
• Vulnerable populations may not perceive or correctly interpret disease signs, leading to delayed response.

Purpose of the Study:

• To investigate the factors contributing to the failure of early detection of bubonic plague outbreaks in a rural Malagasy community.
• To understand the disconnect between observed environmental cues (sick/dead rats) and community perception of disease risk.
• To analyze the impact of socio-cultural and biological factors on plague outbreak control.

Main Methods:

• Qualitative research involving eliciting survivor memories to reconstruct plague transmission chains.
• Analysis of community narratives and their divergence from biomedical indicators.
• Examination of socio-economic factors, historical plague memory, and potential host-pathogen adaptations.

Main Results:

• A 2015 outbreak in a central highlands hamlet resulted in 10 deaths, highlighting a failure in early detection.
• Survivors' memories of dead rats were crucial for reconstructing the transmission, but these signs were largely imperceptible to the wider community.
• Community members constructed alternative narratives for the outbreak, diverging from the rat mortality observations.

Conclusions:

• A phenomenon termed "semiotic cluelessness," stemming from health disparities, lack of historical plague awareness, and host-pathogen adaptations, significantly complicates plague outbreak control in Madagascar.
• Effective zoonotic disease surveillance requires integrating multispecies medical semiotics with community-based understanding and addressing socio-economic determinants of health.