1. LESSON THREE VIRAL INFECTIONS
CHAPTER FOURTEEN
LESSON THREE
VIRAL INFECTIONS

2. OBJECTIVES EXPLAIN HOW VIRUSES INFECT THE BODY.
IDENTIFY THREE COMMON VIRAL INFECTIONS AND THEIR SYMPTOMS.
DESCRIBE HOW VACCINES PROTECT AGAINST DISEASE.

3. BELLRINGER THINK ABOUT THE LAST TIME YOU HAD A COLD. HOW LONG DID THE
COLD LAST? WHAT SYMPTOMS DID
YOU HAVE? IF YOU USED ANYTHING
TO TREAT THE SYMPTOMS, WHAT DID
YOU USE? WAS THE TREATMENT
EFFECTIVE? WRITE YOUR ANSWERS
ON A SHEET OF PAPER.

4. ESSENTIAL QUESTION
WHAT IS AN EXAMPLE OF A VIRAL
INFECTION?

5. DEFINITIONS
MOST SCIENTISTS DO NOT CONSIDER VIRUSES TO BE LIVING THINGS. UNLIKE LIVING THINGS, A VIRUS CANNOT REPRODUCE ON ITS OWN.
WHEN VIRUSES INVADE YOUR CELLS AND USE THEM TO PRODUCE MORE VIRUSES, A VIRAL INFECTION OCCURS.
VIRUSES CAN BE PASSED BY TOUCHING LIVING OR NONLIVING OBJECTS, COUGHING, SNEEZING, INSECT BITES, BLOOD, OR SEXUAL CONTACT.
SYMPTOMS THE SYMPTOMS OF A COLD INCLUDE CONGESTION, A RUNNY NOSE, A SORE THROAT, SNEEZING, AND COUGHING.
TREATMENT THERE ARE MANY MEDICINES THAT CAN TREAT THE SYMPTOMS OF A COLD, AND JUST RECENTLY, A MEDICINE THAT CAN CURE THE COMMON COLD IS AVAILABLE. IF YOU HAVE A COLD, YOU SHOULD DRINK A LOT OF FLUID AND GET PLENTY OF REST.
SYMPTOMS THE SYMPTOMS OF THE FLU INCLUDE BODY ACHES, HEADACHES, A HIGH FEVER, CHILLS, CONGESTION, COUGH, AND A SORE THROAT. A HIGH FEVER IS THE MAIN DIFFERENCE BETWEEN A COLD AND THE FLU. IF YOU THINK THAT YOU MIGHT HAVE THE FLU, YOU SHOULD TALK TO YOUR DOCTOR RIGHT AWAY.
VACCINE ONE WAY TO AVOID THE FLU IS TO BE GIVEN A VACCINE. A VACCINE IS A SUBSTANCE THAT HELPS THE BODY BUILD A RESISTANCE TO A CERTAIN DISEASE.
CAUSE MONONUCLEOSIS, ALSO KNOWN AS MONO OR THE KISSING DISEASE, IS CAUSED BY A VIRUS CALLED THE EPSTEIN-BARR VIRUS, OR EBV.
SYMPTOMS MONONUCLEOSIS CAN MAKE YOU TIRED FOR WEEKS. IT CAN ALSO GIVE YOU A BAD SORE THROAT, A FEVER, A SWOLLEN SPLEEN, AND SWOLLEN LYMPH NODES.
A VACCINE CONTAINS VIRUSES OR PARTS OF VIRUSES THAT HAVE BEEN SPECIALLY TREATED SO THAT THEY DON’T MAKE YOU SICK.
INSTEAD OF INFECTING YOU WITH A VIRUS, VACCINES FOOL YOUR BODY INTO THINKING IT HAS BEEN INFECTED.
YOUR BODY PRODUCES CHEMICALS TO FIGHT THE INFECTION. THESE CHEMICALS THEN GIVE YOU PROTECTION FROM THE REAL VIRUS.