Final answer:
Varicella, or chickenpox, is the infectious condition among the listed options that is included on the Nationally Notifiable Infectious Conditions list due to the requirement to monitor and control its spread.
Step-by-step explanation:
The question asks which condition among listed options is included on the Nationally Notifiable Infectious Conditions list. The correct answer is Varicella, also known as chickenpox. The Varicella-zoster virus causes an infectious skin condition that is required to be reported to national health departments for monitoring and control purposes. Erythema infectiosum caused by parvovirus B19, also known as Fifth Disease, Rotavirus, which is a common cause of severe diarrhoea among infants and young children, and Scarlett Fever caused by Group A Streptococcus bacteria, do appear on various surveillance lists, but what is notable here for Varicella is its unique status of being part of a national tracking system due to its highly contagious nature and the existence of a vaccine to control its spread.