This document discusses communicable diseases, which are diseases caused by infectious agents that can be transmitted from infected people, animals, or the environment. It defines different types of pathogens that cause disease, including bacteria, viruses, fungi, and parasites. It also explains the chain of infection and modes of disease transmission. Finally, it provides examples of common communicable diseases such as dengue fever, the common cold, chickenpox, influenza, tuberculosis, athlete's foot, and hookworm and describes their symptoms and causative agents.

1. COMMUNICABLE
DISEASES
Ciara P.Visaya

2. DISEASE AGENTS
(PATHOGENS)
A microorganism that can cause disease

3. Bacteria •A single-celled
organism living
around most living
and non-living
things.

4. Virus •A small infectious
agent that can only be
replicated inside the
cells of another
organism

5. Fungus •Living organisms
which are
classified in their
kingdom

6. Parasites •An organism that
lives in or on an
organism of another
species.

7. Chain of
Infection

8. Transmission
of
communicable
diseases
• DirectTransmission- the
transfer of any infectious
agent from an infected
host
• IndirectTransmission-
infectious agents are
transferred through
intermediates

9. COMMON
COMMUNICABLE
DISEASES
Diseases caused by infectious agents that can be
transmitted by other people from an infected person,
animal or a source in the environment

10. Dengue
Fever
• a mosquito-borne tropical
disease caused by
the dengue virus.
Symptoms may include a
high fever, headache,
vomiting, muscle and joint
pains, and a characteristic
skin rash.

11. Common
Colds
by Virus
• a viral infectious disease of
the upper respiratory tract
that primarily affects the
nose.The throat, sinuses, and
larynx may also be affected.
These may include coughing,
sore throat, runny nose,
sneezing, headache, and
fever.

12. Chickenpo
x
by Virus
• a very contagious disease
caused by the varicella-zoster
virus (VZV). It causes a blister-
like rash, itching, tiredness,
and fever.The rash appears
first on the stomach, back and
face and then spreads over the
entire body causing between
250 and 500 itchy blisters

13. Influenza
by Virus
• is an infectious disease
caused by
an influenza virus.The
most common symptoms
include: high fever, runny
nose, sore throat, muscle
pains, headache, coughing,
sneezing, and feeling tired

14. Tuberculosis
by Bacteria
•caused by bacteria
(germs) that attack the
lungs or other parts of
the body such as the
kidney, spine or brain.

15. Athlete’
s Foot
by Fungi
•occurs when
the tinea
fungus grows on
the feet

16. Hookworm • is an intestinal parasite
of humans.The larvae
and adult worms live in
the small intestine can
cause intestinal disease.