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Week 4 T1/T2
Mountain Heights Academy
Created on November 21, 2024
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Transcript
Quarter 2 Week 4
VIRUSES
Announcements
Viruses come in many shapes and sizes
CAN evolve and mutate to disrupt cells
ARE MADE OF DNA or RNA surrounded by a protein coat
What is a Virus?
NON-LIVING
NOT MADE OF CELLS
CAN'T REPRODUCE ON THEIR OWN
How do viruses attack cells?
Animals
Bacteria
Plants
Viruses can infect a variety of organisms
What does a plant viral infection look like?
An epidemic is an outbreak of a disease within a population of people during a specific time.
The most common virus in human populations is Influenza, or flu.
The FLU epidemic
Examples of viruses
Disease
- Can happen when viruses kill cells, but they don't always cause cell death. - Homeostasis is disrupted in the host cell, which causes illness.
A pandemic is an epidemic that spreads through human populations across a large region or even worldwide.
Every year in the United States, about 36,000 people die from the flu. Flu pandemics can kill millions of people.
pandemics
Epidemiologists
When a disease breaks out, scientists called epidemiologists investigate the outbreak, looking for its cause. Epidemiologists are like detectives trying to solve a crime. The information epidemiologists learn is important to understand the pathogen, and help prevent future outbreaks of disease.
-A deadly strain of avian flu virus named H5N1 has posed the greatest risk for a new influenza pandemic. -A disease that can be spread from animals to humans is called a zoonosis.
zoonosis
- Stay home if you are sick (social distance).
- Wear a mask to catch droplets from coughs.
- Wash your hands with soap and warm water for 20 seconds to kill germs.
Slowing the spread of viruses
Spread of Viral Disease
The best way to stop the spread of a disease is to educate the community. Most viruses are spread through the air in sneezes or coughs, but they can also spread in saliva, sweat and blood.
Viruses inject their genetic material into a host cell. Once inside, the cell’s own ATP (energy), ribosomes, and enzymes are used to make copies of the virus.