Do Now1) What do doctors do on a daily basis? 2) What do you think EPIDEMIOLOGY means?

Take a guess!

3 min.

What is Epidemiology?WATCH:

Is Epidemiology in Your Future?http://www.rwjf.org/pr/product.jsp?id=26931#content

5 min.

Epidemiology is…

…the branch of medical science that deals with the incidence, distribution, and control of disease in a population

(film definition)

Now… how would you describe epidemiology (beyond the definition)?

EXAMPLES:• Individual pt. vs. groups of people• Global impact• Detective work• Social/behavioral science• Predict & prevent instead of respond to disease• Critical thinking, questions, knowing how to find info• Combining doing good with thinking well• Environmental• Lab• Politics• Broad field

1 min.

Doctors/Health Care Practitioners vs.

Epidemiologists

Doctors & Other Health Care Practitioners

EpidemiologistsBoth

7 min.

Doctors & other health care practitioners

BOTH Epidemiologists

Who: individual patientsHow: taking medical history & conducting a physical exam

Collecting data

Who: entire populations (small or large)How: surveillance systems or descriptive epidemiological studies

Data used to make a diagnosis Using data Data used to generate hypotheses about the relationships between exposure and disease

Test diagnosis by conducting additional diagnostic studies or tests (ex: biopsy or MRI)

Testing Hypothesis

Test hypothesis by analytical studies such as cohort or case-control studies

Prescribes medical treatment to patient

Taking Action

Creates a community intervention to end the health problem and prevent its recurrence

2 min.

Quick Check:

Which of the following situations would an epidemiologist be least likely to investigate?

1) A 20% increase in reports of heat stroke in Chicago this summer

2) A surge of reported flu cases in Illinois3) A recurring ear infection in a 7-year-old girl4) Eight cases of in-school gun violence in one

week in the Bronx, NYC

1 min.

John Snow & the Cholera Outbreak

• Review HW article answers for #1

This water pump, in Soho, London stands as a memorial to John Snow today

2 min.

Imagine…

– What do you need to know about the people who got sick & did NOT get sick in Soho?

– What else do you need to prove your case? (Tests, data, etc.)

3 min.

You are John Snow… trying to prove that cholera is spread by contaminated water

Map the Outbreak!

•RED = WATER PUMPS (wells)

•BLUE = CHOLERA CASES (deaths)

– Plot pumps and cases with your partner (6 min.)– Compare with other pair in group & analyze (2 min.)

• Lay them on top of one another to see a larger sample sizeANSWER:1) What does this data show you? Which pump appears to be the

source of the contamination?2) Is this conclusive proof that “bad water” caused the cholera

epidemic?– Combine data from entire class & analyze (2 min.) 10 min.

Snow’s REAL Map

<1 min.

Snow’s REAL Map

<1 min.

Stretch Your Brain1. Why did we just re-enact Snow’s discovery?2. How do you think Snow created his map? 3. Although Snow was a doctor, how did his

work make him ALSO an epidemiologist? 4. How might epidemiologists’ maps today look

different from Snow’s map? Why?

3 min.