http://www.flickr.com/photos/microbeworld/5733284447

Virus

http://www.flickr.com/photos/mick_hedley/2771290104

http://www.flickr.com/photos/blahman/284050321

Bacteria

http://www.flickr.com/photos/microbeworld/6055678631

T-Cells

http://www.flickr.com/photos/euthman/206766509

Cells

http://www.flickr.com/photos/epsos/4582789354

Medicine

http://www.flickr.com/photos/mricon/1837263

Chicken Pox

http://www.flickr.com/photos/sanofi-pasteur/5283494914

http://www.flickr.com/photos/46183897@N00/5374758002

Protozoa

http://www.flickr.com/photos/miran/59455404

Infection