HIV Infection (image) Gladstone Institutes Caption To discover how HIV causes AIDS, Gladstone scientists studied HIV-infected samples of human tonsil and spleen tissue. In this image, captured by an electron microscope, HIV is infecting these CD4 T immune cells. Credit Gilad Doitsh/Gladstone Institutes Usage Restrictions Please contact Gladstone Press Relations for reprint permissions. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.