Countries have also adopted different testing and counting methods, so comparing the numbers of reported cases does not provide an accurate picture of the progression of the epidemic in different regions.
Nchi zinatofautiana pia katika taratibu zake za kupima na kuripoti, kwa hivyo ulinganisho wa idadi ya visa vilivyoripotiwa hauelezei hadithi kamili ya jinsi janga hili limeendelea katika maeneo tofauti.