a close up of a red substance on a black background

Human Papillomavirus (HPV) 3D renderings of the human papillomavirus (HPV) capsid (red) against a background image that is an inverted transmission electron micrograph of HPV virus particles harvested and purified from cell culture supernatant. HPV infection can be asymptomatic, cause warts, or disrupt cell growth. 3D rendering by NIH 3D (3d.nih.gov/); micrograph captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Maryland. Note: not to scale. Credit: NIAID