Disease Detectives B/C

Test your knowledge of various Science Olympiad events.
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Disease Detectives B/C

Postby bernard » August 30th, 2015, 6:34 pm

Short Event Description: "Students will use investigative skills in the scientific study of disease, injury, health and disability in populations or groups of people with a focus on population growth."

What is the difference between infectivity, pathogenicity, and virulence?
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Re: Disease Detectives B/C

Postby ampy1234567 » September 3rd, 2015, 6:58 pm

What is the difference between infectivity, pathogenicity, and virulence?
Answer
The infectivity of an agent refers to its ability to enter/infect a susceptible host, pathogenicity is the ability of a disease to actually cause disease once it enters, and virulence is how severe the disease the agent causes actually is.
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Re: Disease Detectives B/C

Postby bernard » September 3rd, 2015, 8:25 pm

Great, hit the main points! Here's an answer I found online that adds some examples, too:

"Infectivity is an organism's (a bacteria, virus, fungus, parasite, etc.) ability to infect you. You can be infected but not sick, and there are plenty of times when you're infected but the organism doesn't cause disease.

Pathogenicity is a organism's ability to cause disease. Some organisms are harmless and can live on you or in you without you even noticing. But, if they do cause some sort of disease process, then they are called "pathogens". Some pathogens are less pathogenic than others. For example, E. coli is pathogenic depending on the strain. Others are pathogenic all the time, like HIV, where you will progress to AIDS almost 100% of the time.

Virulence is a measure of the degree of disease that a pathogen causes. For example, there are some very virulent influenza viruses out there that will knock you out and might even kill you. On the other hand, you might catch a strain that infects you, causes disease, but the disease isn't so bad. In that case, the organism is infectious, pathogenic, but not very virulent. Ebola, on the other hand, is very infectious, very pathogenic (because most people who are infected develop disease), and very virulent (because it causes a severe, often fatal disease)."
"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there."

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Re: Disease Detectives B/C

Postby ampy1234567 » September 6th, 2015, 7:55 am

Um wait if an agent infects you, does it just mean it enters your body or does it mean anything else?

Okay now for the actual question:

What are the differences between each type of disease prevention? (primary, secondary, etc.)
Last edited by ampy1234567 on September 7th, 2015, 8:41 am, edited 1 time in total.
Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby bernard » September 6th, 2015, 2:55 pm

Um wait if an agent infects you, does it just mean it enters your body or does it mean anything else?
My understanding is infection is an external agent entering the body and the reaction of the host, your body, to the agent.

I didn't answer the marathon question so someone else should.
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Re: Disease Detectives B/C

Postby ampy1234567 » October 22nd, 2015, 3:33 pm

Wow dead

C'mon guys this is a really easy search-up question
Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » November 1st, 2015, 2:48 pm

Um wait if an agent infects you, does it just mean it enters your body or does it mean anything else?

Okay now for the actual question:

What are the differences between each type of disease prevention? (primary, secondary, etc.)
Answer
Primary prevention: prevents exposure Secondary prevention: screens and treats disease Tertiary prevention: stops, slows, or reverses spread of disease Quaternary prevention: avoids unnecessary intervention

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Re: Disease Detectives B/C

Postby ampy1234567 » November 2nd, 2015, 5:10 am

Um wait if an agent infects you, does it just mean it enters your body or does it mean anything else?

Okay now for the actual question:

What are the differences between each type of disease prevention? (primary, secondary, etc.)
Answer
Primary prevention: prevents exposure Secondary prevention: screens and treats disease Tertiary prevention: stops, slows, or reverses spread of disease Quaternary prevention: avoids unnecessary intervention
Correct, except I think that tertiary prevention means treating the disease in the patient and secondary only refers to treatment in the asymptomatic stage.
Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » November 3rd, 2015, 9:53 am

All right. It's been a while since I did this...

What type of epidemic curve is this?

Image

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Re: Disease Detectives B/C

Postby ampy1234567 » November 3rd, 2015, 5:43 pm

All right. It's been a while since I did this...

What type of epidemic curve is this?

Image
Derp
(Common source) Edit: oooops I forgot intermittent
Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » November 3rd, 2015, 5:48 pm

All right. It's been a while since I did this...

What type of epidemic curve is this?

Image
Derp
Common source
Derp
Progressive source/Propagated
All right your turn I guess.

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Re: Disease Detectives B/C

Postby ampy1234567 » November 3rd, 2015, 5:54 pm

oh
oooooops

If a complete list of those exposed is not available, what type of study should be used to find the relationship between a specific exposure and a disease?
Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » November 3rd, 2015, 6:13 pm

oh
oooooops

If a complete list of those exposed is not available, what type of study should be used to find the relationship between a specific exposure and a disease?
I'm not sure
Cohort Study

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Re: Disease Detectives B/C

Postby ampy1234567 » November 3rd, 2015, 7:23 pm

oh
oooooops

If a complete list of those exposed is not available, what type of study should be used to find the relationship between a specific exposure and a disease?
I'm not sure
Cohort Study
Answer
Case control. Deduce to cohort or case control based on "relationship between a specific exposure and a disease". Out of the two it's case-control (stated in http://epi.publichealth.nc.gov/cd/lhds/manuals/cd/training/Module_1_1.6_ppt_OutbreakInvestigation.pdf, not quite sure why, probably a good thing to search)
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Mounds View High School, 10th grade

2016 Nationals: Dynamic (2), Disease (6), Crave (8), Fossils (22)
2017 Nationals: Disease (1), Dynamic (2), Optics (5)

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » November 4th, 2015, 2:14 pm

Answer
Case control. Deduce to cohort or case control based on "relationship between a specific exposure and a disease". Out of the two it's case-control (stated in http://epi.publichealth.nc.gov/cd/lhds/manuals/cd/training/Module_1_1.6_ppt_OutbreakInvestigation.pdf, not quite sure why, probably a good thing to search)
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Darn I knew it was one of those two. What's the chain of infection? (Define each term in order)


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