2 What is a Virus? Tiny, Non-living particle Invades a living cell, then multipliesOrganism invaded is called a host
3 The Structure of Viruses All viruses have two basic parts: a protein coat that protects the virus and an inner core made of genetic material. Some viruses are surrounded by an outer membrane envelope.
4 BacteriophageVirus that infects a bacteriaMeans “bacteria eater”
5 Active versus hidden viruses Active viruses enter cell and immediately take over and begin multiplyingHidden viruses hide for a while, possibly years, before it becomes active
6 How Viruses MultiplyActive viruses enter cells and immediately begin to multiply, leading to the quick death of the invaded cells.
7 How Viruses MultiplyHidden viruses “hide” for a while inside host cells before becoming active.
8 Common Viral Diseases Flu Cold HIV/ AIDS Herpes Warts Rabies Chicken Pox
9 Spreading Viral Diseases Bodily fluidsAnimal bitesMoisture in aircontact
10 Treating viral diseases No cureSome medications can relieve symptomsNeed to rest, drink fluids, eat healthyVaccines help prevent viruses- release chemicals that stimulate the body’s natural defense