Virus

A virus is a small organism which can infect other biological organisms.

Viruses can only reproduce by invading and taking over cells as they lack the cellular machinery for self reproduction.

They cause diseases in human beings, animals, plants and bacteria.

Examples of human diseases caused by viruses include the common cold, influenza, small pox, AIDS, and cold sores.

Source: GreenFacts

Viruses are not affected by antibiotics, the drugs used to kill bacteria.

Source: GreenFacts

HIV/AIDS - Micro-organism

Deutsch: Virus
Español: Virus
Français: Virus
Nederlands: Virus

AIDS

Arctic Climate Change

Respiratory Diseases

Global Public Health Threats

Bee losses