infectious diseases

1. Infectious DiseasesInfectious Diseases
Chapter 13Chapter 13
““Communicable”Communicable”

2. What is an infectious disease?What is an infectious disease?
Any disease that is caused by an agentAny disease that is caused by an agent
that has invaded the body ---can passthat has invaded the body ---can pass
from one living thing to anotherfrom one living thing to another
Example: influenza (flu)Example: influenza (flu)
Not cancer or heart diseaseNot cancer or heart disease
Also known as “communicable disease”Also known as “communicable disease”

3. What causes infectious diseases?What causes infectious diseases?
 Caused by pathogens (any agent that causesCaused by pathogens (any agent that causes
disease)disease)
 BACTERIABACTERIA
 single-celledsingle-celled
 VIRUSVIRUS
 FUNGIFUNGI
 use nutrients of living or dead organismsuse nutrients of living or dead organisms
 Athlete’s foot, jock itchAthlete’s foot, jock itch
 PROTOZOANPROTOZOAN
 malariamalaria
 PARASITESPARASITES
 Tapeworm, head lice, roundwormsTapeworm, head lice, roundworms

4. What is a bacteria?What is a bacteria?
A single cellA single cell
Common diseases caused by bacteria:Common diseases caused by bacteria:
Strep throatStrep throat
Food poisoningFood poisoning
Urinary tract-infectionsUrinary tract-infections

5. What is a virus?What is a virus?
A microscopic disease causing particleA microscopic disease causing particle
consisting of genetic material and aconsisting of genetic material and a
protein coatprotein coat
Survive by invading a living cellSurvive by invading a living cell
Common diseases caused by a virus:Common diseases caused by a virus:
 COMMON COLDCOMMON COLD
 FLUFLU
 COLD SORECOLD SORE
 MEASLESMEASLES

6. How are infectious diseases spread?How are infectious diseases spread?
Person to person contactPerson to person contact
Food and waterFood and water
EnvironmentEnvironment
Through the airThrough the air
Animals (mosquitoes, ticks)Animals (mosquitoes, ticks)
Contact with contaminated objectsContact with contaminated objects

7. How are infectious diseases treated?How are infectious diseases treated?
 Bacterial diseasesBacterial diseases
 AntibioticsAntibiotics
 Viral diseasesViral diseases
 No cure!No cure!
 Medicines help relieve symptomsMedicines help relieve symptoms
 Fungal diseasesFungal diseases
 Anti-fungal medicineAnti-fungal medicine
 Protozoan infectionsProtozoan infections
 Prescription meds.Prescription meds.
 Parasitic infectionsParasitic infections
 DependsDepends
 Head lice = medicated shampooHead lice = medicated shampoo

8. How do you prevent the spread ofHow do you prevent the spread of
diseases?diseases?
Get vaccinatedGet vaccinated
Keep cleanKeep clean
Wash your hands!Wash your hands!
Don’t share personal itemsDon’t share personal items
Cover your mouthCover your mouth
Be on guard outdoorsBe on guard outdoors
Wear proper clothingWear proper clothing