Complex epidemiology and zoonotic potential for Cryptosporidium suis in rural Madagascar

Area of Science:

• Veterinary Parasitology
• Zoonotic Diseases
• Molecular Epidemiology

Background:

• Cryptosporidium spp. is a major cause of diarrheal disease globally, particularly in children and immunocompromised individuals.
• It poses a significant threat to livestock production and has zoonotic potential.
• Limited research exists on Cryptosporidium ecology in rural areas with high human-animal-wildlife overlap.

Purpose of the Study:

• To investigate the zoonotic potential of Cryptosporidium species in rural Madagascar.
• To identify Cryptosporidium species in humans, livestock, rodents, and wildlife.
• To understand the epidemiology of Cryptosporidium in a tropical rural ecosystem.

Main Methods:

• Screening of humans, livestock, peridomestic rodents, and wildlife for Cryptosporidium.
• Utilizing PCR-restriction fragment length polymorphism (PCR-RFLP) and sequencing for species identification.
• Genotyping analysis to distinguish between different Cryptosporidium species and genotypes.

Main Results:

• Multiple Cryptosporidium species/genotypes were detected in the study system.
• Cryptosporidium suis was the predominant species, found in humans, cattle, pigs, and rodents.
• This study documented the first case of C. suis infection in Africa and the fifth globally.
• Common cattle Cryptosporidium species (C. parvum, C. andersoni) were notably absent.

Conclusions:

• Cryptosporidium suis exhibits a broad host range, infecting diverse species including humans and livestock.
• The prevalence of C. suis in this rural Malagasy population highlights its potential as an underestimated zoonotic agent.
• Further research using genus-specific genotyping is warranted to assess the global distribution of C. suis in human and animal populations.