Harmful viruses attack the cells of human body and multiply in them. Many of them cause contagious diseases. In bio-terrorism, viruses can be used for mass destruction purposes. Hence threat of any viral bio-attack has become a national security as well as public health issue at present. To detect and respond to any viral bio-attack, strong defense systems with sensitive environmental monitoring devices as well as good laboratory facilities are mandatory Это и многое другое вы найдете в книге Virus as a bio-weapon (Masthan K. M. K.,Aravindha Babu N. and Tathagata Bhattacharjee)