Do now:• What is Polio?• Polio is a crippling and potentially deadly infectious

disease caused by a virus that spreads from person to person invading the brain and spinal cord and causing paralysis. Because polio has no cure, vaccination is the best way to protect yourself and the only way to stop the disease from spreading. The spread of polio has never stopped in Afghanistan, Nigeria and Pakistan. Poliovirus has been reintroduced and continues to spread in Chad and Democratic Republic of the Congo after the spread of the virus was previously stopped.

Do now:• Below is a picture in a typical ward for people

afflicted with Polio.

Homework• Due today - 1 page minimum summary of the

first reading.• Due Tuesday June 5th Section 20.3 – Diseases

Caused by Bacteria & Viruses. Pages 586-593• Due Wednesday June 6th Section 32.1- The

Skeletal System. Pages 920-927• Thursday June 7th Quiz on Sections 20.3 & 32.1• Due Thursday June 7th Section 32.2 – The

Muscular System. Pages 928-933• Due Friday June 8th Section 32.3 – Skin – The

Integumentary System. Pages 935 – 939

New Material • What is pathology?• The study of diseases. A Pathogen is anything

that causes a disease. • All known prokaryotic (without a nucleus)

pathogens are bacteria• Louis Pasteur – First to realize that bacteria

can cause disease. • Why do people often get infections from a

hospital if they try so hard to prevent infections.

New Material • Disease Mechanics - Diseases behave in two

ways• 1. Destroy living cells• 2. releasing chemicals that unbalance

homeostasis.• Damaging host tissue – for example:

Tuberculosis, harms the lungs• Toxins released – for example: Botulism (food

tainted).

Examples• The following are examples of common

diseases.• Lyme Disease• Tetanus• Strep throat• Meningitis

New Material • Controlling bacteria:• Physically remove• Disinfect• Food storage• Food processing • Sterilization

New Material • How does a vaccine work?• Explain and discuss• How do anti-biotics work?• Explain and discuss

New Material • Viral diseases such as:• Influenza • AIDS• Chicken pox• These are unaffected by anti-biotics

New Material • Why do doctors insist that the patient use up

all of the medicine prescribed? • Cause of Superbugs• Emerging diseases:• West Nile Virus, E.E.E. (Eastern Equine

Encephalitis), MRSA, AIDS,…• Cover why AIDS is so difficult combat.