ALHASSAN CHARITY JUMAI and AKPAGHER, AONDOTSEA CALEB 2025. USING NONLINEAR MATHEMATICAL MODEL TO STUDY THE IMPACT OF INFECTIOUS DISEASE ON CORONAVIRUS DISEASE IN A FUZZY ENVIRONMENT. Journal of Systematic and Modern Science Research. 7, 9 (Mar. 2025). DOI:https://doi.org/10.70382/bejsmsr.v7i9.004.