Jewaidu Rilwan is a lecturer in mathematics at Bayero University, Kano, Nigeria. He was hosted by Prof. Massimiliano Ferrarra at the Mediterranean University of Reggio Calabria, Italy. During the research period, Jewaidu Rilwan did research on game value of a pursuit-evasion game problem with Gronwall-type constraints on controls and on the stabilization of COVID-19 lockdown policy: the fictitious-potential game approach.

Akindele Onifade is a lecturer in the department of computer science and mathematics at the Mountain Top University, Ibafo, Ogun, Nigeria. He was hosted by Prof. Calistus N. Ngonghala U at the University of Florida, USA. During the research period, Akindele Onifade did research on mathematical models to investigate the health impact of co-infection of humans with COVID-19 and HIV.

Abimbola Abolarinwa is a lecturer in the department of mathematics at the University of Lagos, Nigeria. He was hosted by Prof. Michael Ruzhansky at the Ghent Analysis & PDE Centre, Ghent University, Belgium. During the research period, Abimbola Abolarinwa did research on Picone type identities and their applications in the analysis of partial differential equation.

Celestin Lele is a professor of mathematics at the University of Dschang, Cameroon. He was hosted by Prof. Lutz Strungmann at the University of Applied Sciences, Mannheim, Germany. During the research period, Celestin Lele did research on residuated lattices and possible applications in Mathematical Biology.

Kolaye Gabriel Guilsou is a lecturer of applied mathematics at the University of Maroua, Cameroon. He was hosted by Professor Aziz Alaoui, at the Université du Havre, France. During the research period, Celestin Lele did research on parameters and states estimation in a COVID-19 model under climatic and immunological factors: A study case of Cameroon.

Rezki Chemlal is an assistant professor at the University of Béjaia, Algeria. He was hosted by Professor Alejandro Maas at the University of Santiago, Center for Mathematical Modeling, Chile. During the research period, Rezki Chemlal did research on ergodic and topological properties of one dimensional cellular automata and more generally about symbolic dynamics, topological dynamics and ergodic theory.

Fatma Ebrahim is an assistant professor at the Faculty of Science, AL-Azhar University, Egypt. She was hosted by Professor Sergio Roberto López-Permouth at the Ohio University, USA. During the research period, Fatma Ebrahim did research on the study of amenable bases of infinite dimensional algebras in at least two directions.

Djoukwe Tapi Myriam Sonia is a researcher at the University of Douala, Cameroon. She was hosted by Professor Nguyen-Huu Tri at the Institut de Recherche pour le Développement (IRD), France. During the research period, Djoukwe Tapi Myriam Sonia did research on mathematical modelling with applications in ecology, agronomy and epidemiology directions.

Julius Ehigie is a lecturer at the University of Lagos, Nigeria. He was hosted by Professor Dr. Vu Thai Luan at the Mississippi State University, USA. During the research period, Julius Ehigie did research on optimized and parallel exponentially fitted two-derivative Runge-Kutta methods with optimized dispersion and dissipation order (phase properties).

Hassane Bouzahir is a Professor at the Ibn Zohr University, Agadir, Morocco. He was hosted by Prof. Alessandro N. Vargas at the Federal University of Technology - Parana, Brazil. During the research period, Hassane Bouzahir did research on stochastic (switched) dynamical systems and application in engineering such as automation, circuit dynamics and renewable energy.

Plaire Tchinda Mouofo is a Senior Lecturer at the University of Maroua, Cameroon. He was hosted by Prof. Ousmane Seydi at the École polytechnique de Thiès, Senegal. During the research period, Plaire Tchinda Mouofo did research on computer, optimal control for delayed differential equations and mathematical modelling of dynamical systems.

Alexis Nangue is a Senior Lecturer at the Higher Teachers’ Training College of the University of Maroua, Cameroon. He was hosted by Prof. Alan D. Rendall at the Johannes Gutenbuerg University of Mainz, Germany. During the research period, Alexis Nangue did research on stability and periodic oscillations of an in-host model of hepatitis C with therapy.

Adolphus Wagala is a Senior Lecturer at the Bomet University College, Kenya. He was hosted by Prof. Graciela González Farías at the Centro de Investigacion en Matematicas, AC, Mexico. During the research period, Adolphus Wagala did research on novel spatio-temporal machine learning models for the early prediction of areas at risk of arbovirus transmission.

Martins Onuorah is an associate professor at the Kampala International University, Uganda. He was hosted by Prof. Nandadulal Bairagi at the Jadavpur University, Kolkata, India. During the research period, Martins Onuorah did research on optimal control model of COVID-19 as a case study of the Republic of Uganda.