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

Vaccine

Chicken Pox

http://www.flickr.com/photos/andywilkes/3479998109/

Medicine

http://www.flickr.com/photos/calliope/69793118/

Bacteria

http://www.flickr.com/photos/kaibara/2234750993/sizes/o/in/photostream/

Virus

http://www.flickr.com/photos/ajc1/1257163357

Colds

http://www.flickr.com/photos/micahtaylor/4333290293/

Polio

http://www.flickr.com/photos/cambodiatrust/846493728/

Small Pox

http://www.flickr.com/photos/blkjesus01/516325420/

Tuberculosis

http://www.flickr.com/photos/ashclements/54559142/

Macrophage

http://www.flickr.com/photos/magnaram/4509223/