Transcript Chapter 12 Lesson 1

Understanding Communicable
Diseases
Causes of Communicable
Diseases
Germs and Diseases
Germ and Diseases
Communicable Diseases – Disease that
can be passed from one person to another
- communicable disease caused by
microorgansims that can only be seen
through an microscope
Non Communicable Diseases – Like
asthma that cannot be passed from one
person to another
Types of Germs
• Viruses – The smallest and simplest life
form. They cause a wide range of
diseases.
• Most diseases caused by virus or bacteria
• Colds, chicken pox, AIDS, viral
pneumonia, flu, measles, smallpox,
mumps, herpes, rabies, polio,
mononucleosis
Types of Germs
• Bacteria – Tiny one celled oraganisms
that live nearly everywhere
• Most harmless, but some cause disease
• Virus and bacteria most common cause of
disease
• Strep throat, tuberculosis, pinkeye, food
poisoning, typhoid fever, gonorrhea,
diptheria, lyme disease, bacterial
pnuemonia
Types of Germs
• Fungi – Primitive life forms that cannot
make their own food
• Athletes foot
• Ring worm
Types of Germs
• Protozoa – One celled, animal-like
organisms
• Many are harmless
• Cause diseases as malaria and amebic
dystentery
How Germs are spread
• Direct contact – you get germs on your
hands and skin through direct contact with
another person
• Sometimes by sexual contact
How Germs are spread
• Indirect contact – someone coughs or
sneezes, expelling germs into the air
• Other people breath these germs
• Colds, flu, tuberculosis spread this way
• Drinking glasses, eating utensils, other
personal items
How Germs are spread
• Contact with animals or insects –
• Rabid animals spreads rabies
• Lyme disease is transmitted through tick
bites
How Germs are spread
• Other Contacts – Contaminated food or
water
• This type of food poison is called
Salmonella