¹ Sapienza University of Rome, Department of Public Healthand Infectious diseases, Rome, Italy. Presbyterian University of Cameroon, Department of Biomedical science, Bandjoun, Cameroon ;

² Botswana-University of Pennsylvania Partnership, BUP Joint Laboratory, Gaborone, Botswana. University of Botswana, Department of Biomedical Science, Gaboraone, Botswana ;

³ University of Dschang, Department of Biomedical Science, Dschang, Cameroon ;

⁴ Botswana-University of Pennsylvania Partnership, BUP Joint Laboratory, Gaborone, Botswana ;

⁵ Botswana-Harvard partnership,BHP Laboratory, Gaborone, Botswana ;

⁶ Projet Intégré pour la promotion de l’Auto-Développement(PIPAD), Dschang, Cameroon ;

⁷ Sapienza University of Rome, Department of Public Healthand Infectious diseases, Rome, Italy