http://farm4.staticflickr.com/3195/2945724127_b18b5f8eca_z.jpg

vaccine

http://farm

1.staticflickr.com/124/389824828_81e029507e_z.jpg

antibiotics

http://farm7.staticflickr.com/6017/5966487863_6f334cbd19_z.jpg

Chicken pox

http://farm3.staticflickr.com/2241/2192450204_7b04613e25_z.jpg

virus

http://farm6.staticflickr.com/5205/5280405700_715ae4a129_z.jpg

Bacteria

http://farm4.staticflickr.com/3577/3409509048_29c726aed1.jpg

Antibodies

Macrophages

Fungi

Malaria

Tuberculosis