L 35.3 Fighting infectious diseases

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L 35.3 Fighting

infectious diseases

* Learning Objectives:

21.1 Distinguish between active immunity and passive immunity

21.2 Describe how public health measures and medications fight disease

21.3 Describe why patterns of infectious disease have changed

https://www.youtube.com/watch?v=PNTDpxsrNGM (Incorporar)

Section A

Discovering Vaccination

http://www.sciencemuseum.org.uk/broughttolife/people/jamesphipps.aspx

Acquired Immunity You can

acquire immunity without having a disease.

Vaccination is the

injection of a weakened or mild form of a pathogen to cause immunity.

http://www.immunizationcards.org/are-united-arab-emirates

Active

immunity results from vaccines or natural exposure to an antigen.

Passive

immunity forms when antibodies are introduced into the body. It lasts

only until

the immune system destroys the foreign antibodies.

* Task 1 :

Watch the video "Types of Immunity", read the summary about different immunity to answer Section A in worksheet {Emailed}

Section B

Public Health and

Medications In 2005, less than 5 percent of human deaths were caused by

infectious diseases. This statistic is the result of two major factors.

The field of public health

provides services that help monitor food and water supplies and promote

vaccinations and healthy behavior.

The development and use of

many new medications, particularly antibiotics and antiviral drugs, has saved

many lives by helping to cure infectious diseases.

* Task 2:

read and discuss

the story of John Snow and the Broad Street pump.{Link is provided} & describe how Public health measures help prevent disease.

Complete Section B in the worksheet http://www.ph.ucla.edu/epi/snow/snowcricketarticle.html

Section C

New

and Re-Emerging Diseases Since 1980, many new diseases have appeared and several diseases

once thought to have been eradicated have recurred. There are two main reasons

for these changes.

Interactions with exotic

animals have increased.

The misuse of medications

has caused diseases that were once under control, such as tuberculosis and

malaria, to evolve resistance to many antibiotics.

https://www.youtube.com/watch?v=Wea9MMhc7Y0 (Incorporar)

* Task 3 : work in groups to search and describe how changing

interactions with animals & misuse of medications led to the

emergence of new diseases and re-emergence of diseases that many people thought

were under control.

- Complete Section C in the worksheet.

* Homework: Complete L 35.3 assessment and submit by email