The lack of financial resources, the absence of a numerous and properly prepared staff to apply the vaccine and to identify and distinguish smallpox from chickenpox or other vesicle-producing diseases, as well as a limited number of nursing assistants, vaccine analysts and epidemiologists were all factors that contributed to vaccination shortcomings.
Sobresalían la falta de recursos económicos, la ausencia de un personal numeroso y debidamente preparado para aplicar la vacuna y para identificar y distinguir a la viruela de la varicela y de otras enfermedades vesiculares, la escasez de técnicos, lectores de vacuna y epidemiólogos.