http://www.flickr.com/photos/two-wrongs/321902538

Fungi

http://www.flickr.com/photos/microbeworld/5957846000

Bacteria

http://www.flickr.com/photos/outofideas/215244312

Malaria

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

Antibiotics

VaccineVaccine

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

http://www.flickr.com/photos/themaxsons/2849159830

Chicken pox

http://www.flickr.com/photos/hmmmmm/3903176411

Antibodies

Virus

http://www.flickr.com/photos/sanjayaprime/3490081105

http://www.flickr.com/photos/nottinghamvets/5828221893

Macrophage

http://www.flickr.com/photos/microagua/4491204570

Protozoa