1 European Parliamentary Research Services (EPRS), European Parliament, Brussels, Belgium. Electronic address: gianluca.quaglio@europarl.europa.eu.
2 Division of Medical Virology, Faculty of Medicine & Health Sciences, Stellenbosch University and National Health Laboratory Service Tygerberg, Cape Town, South Africa.
3 Operational Research Unit, Doctors with Africa CUAMM, Padua, Italy.