envelope « Back to Glossary IndexA term used to described the outer membrane of a virus Related Articles: 13 – 4 The viral life cycle, late events17 – 4 Vaccines train the immune system to fight disease18 – 3 Bacillus anthracis is an endospore-forming microbe that can causes a lethal toxic infection called anthrax18 – 11 Cold and flu viruses18 – 12 Measles virus — An old enemy that is trying to make a comeback« Back to Glossary Index