There are many kinds of virus that are able to infect animal cells.
(a)[4]
Compare the structure of a typical virus with a typical animal cell.
(b(i))[3]
Human immunodeficiency virus (HIV) is one type of virus.
Describe the routes by which HIV is transmitted.
(b(ii))[3]
Use the table data to describe how the numbers of infected and treated people changed between 2000 and 2018.
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