Department of Mathematics University of Dhaka Dhaka Bangladesh;
Department of Chemistry Colby College Maine USA;
Department of Mathematics University of Dhaka Dhaka Bangladesh;
Department of Genetic Engineering and Biotechnology University of Dhaka Dhaka Bangladesh;
Department of Computer Science & Engineering State University of Bangladesh Dhaka Bangladesh;
Department of Mathematics University of Dhaka Dhaka Bangladesh;
Department of Mathematics Bangladesh University of Engineering and Technology Dhaka Bangladesh;
Department of Mathematics University of Dhaka Dhaka BangladeshDepartment of Mathematics and Statistics University of Calgary Calgary Canada;
Natural Immunity; Medicated Immunity; Physical Exercise; Vaccination; Infectious Diseases;