1. Sick
http://www.flickr.com/photos/kalexanderson/5421517469

2. Medicine
http://www.flickr.com/photos/selva/7637352

3. Cells
http://www.flickr.com/photos/jonmcgovern/3069817485

4. Vaccination
http://www.flickr.com/photos/andresrueda/2983149263/

5. Disease
http://www.flickr.com/photos/yofotografista/4304540164

6. Virus
http://www.flickr.com/photos/mugley/4007138829

7. Antigen
http://www.flickr.com/photos/ringai/3974639591/

8. Pathogen
http://www.flickr.com/photos/28634332@N05/5984807021/

9. Fungi
http://www.flickr.com/photos/rachel_s/1518150683/

10. Bacteria
http://www.flickr.com/photos/kaibara/2234750993/