Sick

http://www.flickr.com/photos/hamed/262522417

Doctor

http://www.flickr.com/photos/chuckp/20617327

Vaccine

http://www.flickr.com/photos/unicefsverige/4415955719

Polio

http://www.flickr.com/photos/cambodiatrust/2781201572

Antibiotics

http://www.flickr.com/photos/sparktography/388889060

Bacteria

http://www.flickr.com/photos/estherase/34165928

Cells

http://www.flickr.com/photos/exothermic/2546338537

Fever

http://www.flickr.com/photos/cverdier/4140230315

Fungi

http://www.flickr.com/photos/rachel_s/1773289807

Contagious

http://www.flickr.com/photos/enggul/3332051944