Throat and nose membranes hurt by dry air allow cold viruses to enter more easily. It is important to carry out sensible counter plans against the cold with heaters and against the dryness with humidifiers.

The speed of the spread of AIDS is horrifyingly fast.

Apparently my anti-virus software is not up to snuff.

In short, it is because the 'plan.doc' file I attached in the previous email was infected with a virus.

Something else to be borne in mind here is the rapidity with which the virus can reproduce.

Cancer may be related to viruses of some kind.