100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
BIS 2B FINAL exam study guide questions and answers correct and verified 100% $12.99
Add to cart
Quickly navigate to
Preview
  2.  
  3. BIS 2B FIN
  4.  
  5. BIS 2B FIN

Exam (elaborations)

BIS 2B FINAL exam study guide questions and answers correct and verified 100%
 0 purchase
  • Course
  • BIS 2B FIN
  • Institution
  • BIS 2B FIN

BIS 2B FINAL exam study guide questions and answers correct and verified 100% BIS 2B FINAL exam study guide questions and answers correct and verified 100% In class we introduced a very simple 'SIR' model for the dynamics of an epidemic pathogen in a host population. We derived an expressi...

[Show more]

Preview 2 out of 15  pages

Document information

  • October 3, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • bis 2b final exam study guide questions and answer

Written for

  • BIS 2B FIN
  • BIS 2B FIN

Seller

avatar-seller
clevercopies

Reviews received

Content preview

BIS 2B FINAL exam study guide question
bh bh bh bh bh bh




s and answers correct and verified 100%
bh bh bh bh bh bh




Inbhclassbhwebhintroducedbhabhverybhsimplebh'SIR'bhmodelbhforbhthebhdynamicsbhofbhanbhepidemic

pathogenbhinbhabhhostbhpopulation.bhWebhderivedbhanbhexpressionbhthatbhdescribesbhthe

conditionsbhunderbhwhichbhanbhepidemicbhwillbhoccur:

βS/γbh>1

(A)bhWhatbhbiologicalbhprocessesbharebhrepresentedbhbybhβ,bhS,bhandbhγ?bh-bhcorrectbhanswers-
βbhisbhthebhpathogen'sbhtransmissionbhrate.

Sbhisbhthebhnumberbhofbhsusceptiblebhhosts

present.

γbhisbhthebhratebhofbh'removal'bhofbhthebhinfectedbhhostsbhfrombhthebhpopulationbhthroughbheitherbhdeathbhorbhrec
overybhwithbhsubsequentbhimmunitybh(forbhvertebratebhhosts)

Inbhclassbhwebhintroducedbhabhverybhsimplebh'SIR'bhmodelbhforbhthebhdynamicsbhofbhanbhepidemic

pathogenbhinbhabhhostbhpopulation.bhWebhderivedbhanbhexpressionbhthatbhdescribesbhthe

conditionsbhunderbhwhichbhanbhepidemicbhwillbhoccur:

βS/γbh>1

(B)bhWhatbhisbhthebhbiologicalbhsignificancebhofbh1/γ?bh-bhcorrectbhanswers-1/γ

isbhthebhmeanbhtimebhthatbhanbhinfectedbhindividualbhhasbhthebhdiseasebhandbhcanbhinfectbhotherbhindividualsbhwit
hinbhthebhhostbhpopulation.

Inbhclassbhwebhintroducedbhabhverybhsimplebh'SIR'bhmodelbhforbhthebhdynamicsbhofbhanbhepidemic

pathogenbhinbhabhhostbhpopulation.bhWebhderivedbhanbhexpressionbhthatbhdescribesbhthe

conditionsbhunderbhwhichbhanbhepidemicbhwillbhoccur:

βS/γbh>1

(C)bhExplainbhinbhabhsentencebhorbhtwobhwhybhthebhpathogenbhshouldbhspreadbhifbhthisbhconditionbhis

satisfied.bh-bhcorrectbhanswers-
Thebhpathogenbhshouldbhspreadbhanybhtimebhthisbhconditionbhisbhsatisfiedbhbecausebhthisbhconditionbhsaysbhthatb
heachbhinfectedbhindividualbhwillbhgivebhrisebhtobh>1bhotherbhinfectedbhindividual.bhSo,bhthisbhsaysbhthatbhthebhpop

ulationbhofbhinfectedbhindividualsbhwill,bhatbhleast

, initially,bhincrease.

Inbhclassbhwebhintroducedbhabhverybhsimplebh'SIR'bhmodelbhforbhthebhdynamicsbhofbhanbhepidemic

pathogenbhinbhabhhostbhpopulation.bhWebhderivedbhanbhexpressionbhthatbhdescribesbhthe

conditionsbhunderbhwhichbhanbhepidemicbhwillbhoccur:

βS/γbh>1

(D)bhWhatbhprocessbhwillbheventuallybhcausebhthebhepidemicbhtobhend?bh-bhcorrectbhanswers-
Inbhthisbhmodel,bhtherebhisbhnobhbirthbhprocessbhrepresentedbhforbhthebhhostbhpopulation.bhSo,

thebhtotalbhnumberbhofbhhostsbh(susceptible,bhinfected,bhandbh'removed')bhisbhconstantbhoverbhtime.bhThus,bhasbh
thebhepidemicbhspreads,bhthebhnumberbhofbhsusceptiblebhhostsbhisbhprogressivelybhreducedbhinbhsize.bhEventuall
ybhthebhcriticalbhconditionbhforbhfurtherbhspreadbhofbhthebhepidemicbh(βS/γ>bh1)bhwillbhnobhlongerbhbebhsatisfied,bh
andbhthebhnumberbhofbhinfectedbhindividualsbhwillbhdeclinebhtobhzero.

Patternsbhofbhplaguebh(Yersiniabhpestis)bhoutbreaksbhinbhgerbilbhpopulationsbhinbhnaturebhsuggestbh-
bhcorrectbhanswers-

thatbhplaguebhepidemicsbhoccurbhonlybhwhenbhgerbilbhdensitiesbhexceedbhabhcriticalbhdensitybhthreshold

Bybhexperimentallybhremovingbhparasiticbhnematodesbhfrombhpopulationsbhofbhredbhgrouse,bhresearchersbhde
monstratedbhdefinitivelybhthatbh-bhcorrectbhanswers-
nematodebhinfectionbhwasbhresponsiblebhforbhthebhperiodicbhcrashesbhofbhthebhgrousebhpopulations

Inbhabhsentencebhorbhtwo,bhexplainbhwhatbhisbhmeantbhbybh"herdbhimmunity."bh(B)bhWhybhmight

itbhbebhimportantbhforbhhumanbhsocietiesbhto

mandatebhimmunizationbhagainstbhsevere

infectiousbhdiseasesbhlikebhwhoopingbhcough?bh-bhcorrectbhanswers-
Herdbhimmunitybhrefersbhtobhthebhconditionbhwherebhunvaccinatedbhindividualsbharebhprotectedbhfrombhdisease
bhepidemicsbhinbhabhpopulationbhwherebhvaccinationbhratesbharebhsufficientlybhhighbhthatbhepidemicsbhcannotbho

ccurbh(i.e.,bhwherebhthebhproportionbhofbhvaccinatedbhindividualsbhsatisfiesbhthebhcondition:bhp>1-1R0).

Mandatorybhimmunizationbhisbhespeciallybhimportantbhwherebh100%bhimmunizationbhofbhthebhhostbhpopulatio
nbhisbhnotbhpossiblebhorbhwherebhthebhyoungestbhindividualsbhcannotbhbebhimmunizedbheffectivelybh(e.g.,bhbecau
sebhofbhtheirbhimmaturebhimmunebhsystems)bhbutbhare

vulnerablebhtobhseverebhformsbhofbhthebhinfectiousbhdisease.

Inbhclassbhwebhworkedbhthroughbhanbhexperimentbhthatbhdemonstratedbhthatbhmutualismsbhbasedbhonbhresourc
ebhexchangebhcanbhworkbhwhenbhonebhorganismbhisbhparticularlybhgoodbhatbhsecuringbhonebhessentialbhresourceb
h(C)bhandbhanotherbhorganismbhisbhparticularlybhgoodbhatbhsecuringbhabhdifferentbhessentialbhresourcebh(P).bhThebh

organismsbhcanbhbothbhincreasebhtheirbhreproductivebhsuccessbhbybhtradingbhwithbheachbhother.bh

Canbhmutualismsbhbasedbhonbhresourcebhexchangebhstillbhbebhfavoredbhbybhnaturalbhselectionbhifbhonebhofbhthebho
rganismsbhisbhnotbhbetter,bhinbhanbhabsolutebhsense,bhatbhsecuringbheitherbhofbhthebhtwobhresources?bhUsebhtableb
hbelowbhtobhanswerbhquestion.bhNotebhthatbhSpeciesbhBbhnowbhharvestsbhlessbhCbhand

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller clevercopies. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling

Recently viewed by you

Exam (elaborations) ·

(0)

Ics 300 test with correct answers
$12.99
  • (0)
Add to cart
Added