Human Schistosomiasis due to Schistosoma bovis in Nigeria.

Schistosomiasis is a global public health challenge, especially in sub-Saharan Africa, where Nigeria has the highest burden of disease. Schistosoma hybrids have been discovered in various countries, including Nigeria, where livestock and human beings share common water resources. This study, carried out in three communities, two of which are endemic for urinary schistosomiasis, aimed to identify the urinary schistosomiasis causative agent by using a species-specific molecular technique and their evolutionary relationship. Polymerase chain reaction using primers specific for a partial DNA sequence of the mitochondrial cox1 gene of Schistosoma haematobium was carried out on pooled urine sediments preserved in 70% ethanol. DNA from the high-intensity pooled samples from Onye-Uku camp amplified, and a BLAST search identified the pooled samples as Schistosoma bovis, whereas S. haematobium DNA did not amplify. The phylogenetic relationship of the sequence showed that it clustered with an S. bovis hybrid obtained from a human host in Côte d'Ivoire and had close ancestry with isolates from cattle in Cameroon. This finding revealed the prevalence of S. bovis among some inhabitants in a zone in Nigeria where schistosomiasis is endemic.