For that disease explain:
Pathogenicity, transmission, stages of disease, signs and symptoms and timeline, virulence factors, replication, vaccine (if any what and when is it given, how effective) and describe some epidemiology about the disease including who is at risk, how many, where etc, may be US or global based epidemiology. Be comprehensive, be detailed, include citations and references.
All applicants go through a series of tests that check their level of English and knowledge of formatting styles. The applicant is also required to present a sample of writing to the Evaluation Department. If you wish to find out more about the procedure, check out the whole process.