These retroviruses, as they are known, can invade normal cells without killing them.

Shown here is a color-enhanced, magnified view of salmonella bacteria invading human cells.

C jejuni appears to achieve this by invading and destroying epithelial cells.

The discovery grew out of an effort, beginning 15 years ago, to understand how the influenza virus changes shape when it invades cells.

Tumors invade other cells and begin to spread through a process known as metastasis.

This aids cell attachment and helps the bacteria invade eukaryotic cells.

Viruses must invade cells in order to reproduce.

The merozoites are released by lysing the host cell which in turn invade other cells.

It is used to quantify the ability of pathogenic bacteria to invade eukaryotic cells.

As Toxoplasma spreads through the body, it invades cells.