The bacteria rickettsia and chlamydia are living cells that, like viruses, can reproduce only inside host cells.

If bacteria make it past our immune systems and start reproducing inside our bodies, they cause disease.

If a person has a severe (serious) infection, the virus reproduces much more quickly inside the body.

She reproduces inside the gall and her tiny offspring ( 400 microns) escape through the same small opening.

It binds to and enters white blood cells, and reproduces inside the cells while they move throughout the body.

Viruses infect host cells and reproduce inside them.

A virus is an invasive biological agent that reproduces inside the cells of living hosts.

The weakened live virus reproduces inside the person's nose and produces viruses that the immune system learns to attack.

M. tuberculosis actually reproduces inside the macrophage and will eventually kill the immune cell.

Viruses, however, always reproduce inside other living things.