Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Bacteriophage wikipedia , lookup
Ebola virus disease wikipedia , lookup
Viral phylodynamics wikipedia , lookup
Virus quantification wikipedia , lookup
Negative-sense single-stranded RNA virus wikipedia , lookup
Oncolytic virus wikipedia , lookup
Social history of viruses wikipedia , lookup
Influenza A virus wikipedia , lookup
Introduction to viruses wikipedia , lookup
Plant virus wikipedia , lookup
VIRUSES! Viruses Tiny NON-LIVING particle that enters and then reproduces inside a living cell. Considered to be NON-LIVING because they are not cells and cannot make or take in food. Size of Viruses Structure of a Virus All viruses have 2 basic parts: a protein coat that protects the virus and an inner core made of genetic material. Come in different shapes (but all have those 2 parts) How Viruses Multiply Although viruses can multiply, they do so differently than organisms. Viruses can multiply ONLY when they are inside a living cell. Host: organism that provides a source of energy for a virus or another organism. How Viruses Multiply 1. Virus attaches to a cell 2. Virus injects into genetic material 3. Virus’ genetic material takes over the cell’s functions. It instructs the cell to produce the virus’ proteins and genetic material. 4. The proteins and genetic material then assemble into new viruses. 5. The cell bursts and releases new viruses Question to consider If a parasite is an organism that lives on or inside a host and causes it harm than…How are viruses different than parasites??? Virus Replication Infectious Diseases • Any disease that you can pass on to another person • Spread by pathogens which are usually microscopic and impossible to see • Spread by vectors, animals that do not actually get the disease, such as ticks, mosquitos, or rats Viral Diseases Dangers: reproduce quickly, can alter original cell function Transmission: depends, some airborne, touch, or bodily fluids Examples: HIV/AIDS, Hepatitis, Flu, Cold, Chickenpox, Ebola, Cold sores Treatment: No cure for viruses, only vaccines which are preventative for some viruses Epidemic • When a large number of people in an area or community all become infected with the same disease Examples: (pick 2) • Smallpox in the “New World” in 1500’s • Flu of 1918 • Swine flu of 2009 Pandemic An epidemic on a much larger scale, continentwide or world-wide Examples: • Black Death (bubonic plague) in 1600’s • HIV/AIDS in Africa