Paper must be APA style format. It can be on any virus from microbiology perspective and what disease it can cause etc. It should be 3 to 5 pages including the citation/ reference page and the title page. So basically 3 pages of writing. And off course must importantly it MUST be free of plagiarism.
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.