T ey could record their thoughts using the blank tables provided in the PDF or using a table/notes of their own devising.
Students should then feed back into the larger group so that between them, they can identify the three diseases which are the biggest problem. Encourage them to justify their choices.
Feed back visually, discussing the various categories which each disease belongs in if possible.
If you wish, you can ask them to identify the disease which causes them the least concern collectively (but is still enough of a problem to be mentioned by at least one of the students).
Check that students understand some of the concepts and vocabulary in the unit, including: