When an animal is infected, either naturally or by experimental injection, with a bacterium, virus, or other foreign body, the animal recognises this as an invader and acts in such a way as to remove or destroy it.

The 50th Earth Day was always going to be special, but the coronavirus pandemic has made it even more so. The unprecedented steps the world has taken to slow the spread of the virus have dramatically reduced the number of cars on the road, planes in the air, and oil being pulled from the ground.

An asteroid or a supervolcano could certainly destroy us, but we also face risks the dinosaurs never saw: An engineered virus, nuclear war, inadvertent creation of a micro black hole, or some as-yet-unknown technology could spell the end of us.

The unique nature about the influenza virus is its great potential for changes, for mutation.

Misinformation is a virus unto itself. And Fox News is the vector.

An inefficient virus kills its host. A clever virus stays with it.

Life on Earth is at the ever-increasing risk of being wiped out by a disaster, such as sudden global nuclear war, a genetically engineered virus or other dangers we have not yet thought of.

What perhaps should receive more attention is the effect of the treatment on the virus.

I discovered in Melbourne how wonderful it is to be part of a successful team, when good morale spreads throughout the squad, among athletes and coaches and infects you like a virus - but one that you want to catch.

The virus that causes AIDS is the trickiest pathogen scientists have ever confronted. It mutates furiously, it has decoys to evade the immune system, it attacks the very cells that are trying to fight it, and it quickly hides itself in your genome.

We have met the Devil of Information Overload and his impish underlings, the computer virus, the busy signal, the dead link, and the PowerPoint presentation.

You can't take a knife on a plane anymore, but you can get on carrying a virus.

Most of the trouble in this world has been caused by folks who can't mind their own business, because they have no business of their own to mind, any more than a smallpox virus has.

We started the AIDS virus. We are only able to maintain our level of living by making sure that Third World people live in grinding poverty.

I pictured myself as a virus or a cancer cell and tried to sense what it would be like.

She is like a monkey virus and will infect you and bleed you dry after you've given her too much personal information, and no reaction, word or deed from Courtney Love should surprise anyone.

After all, just one virus on a computer is one too many.

Of course, screening for HIV did essentially eliminate the transmission of this virus by transfusions.

Changes... can only be effected by alterations in the original. The only thing not prerecorded in a prerecorded universe are the prerecordings themselves. The copies can only repeat themselves word for word. A virus is a copy. You can pretty it up, cut it up, scramble it - it will reassemble in the same form.

Think of the earth as a living organism that is being attacked by billions of bacteria whose numbers double every forty years. Either the host dies, or the virus dies, or both die.