Salmonella Intermediate 06/20/2013 SARS Virus Intermediate 06/20/2013 HIV-1 TEM Intermediate 04/29/2013 Avian influenza Intermediate 04/29/2013 Adenovirus Intermediate 04/29/2013 Neutrophils engulfing anthrax bacteria Advanced 09/19/2012 The Spread of HIV Intermediate 09/19/2012 Bacterial Cell 3D model - Unlabeled Beginner 09/19/2012 Flagellum Anatomy Intermediate 07/05/2012 HIV-Infected Macrophage Advanced 06/25/2012