You want to reduce the amount of virus particles in your body.

This is done to reduce the number of virus particles that enter the body.

All that's needed to trigger a cold is a dozen or so virus particles.

Many of the virus particles are likely to be killed by heat and sunlight on a beach, he added.

During this process, the body is partly transformed into virus particles.

The immune system then works to destroy the virus particles.

Typically, the cell is killed, and many new virus particles emerge.

Now look at these three tape recorders and think in terms of the virus particle.

Virus particles are difficult to detect and not used for transmission of infection.

He saw virus particles shaped like snakes, in negative images.