100% tevredenheidsgarantie Direct beschikbaar na je betaling Lees online óf als PDF Geen vaste maandelijkse kosten
logo-home
Eerder door jou gezocht
Eerder door jou gezocht
logo
NR 503 Week 8 Final Exam Questions and Answers (2025 / 2026)(Verified Answers) €12,75
In winkelwagen
Snel navigeren naar
Voorbeeld
  2.  
  3. NR 503
  4.  
  5. NR 503

Tentamen (uitwerkingen)

NR 503 Week 8 Final Exam Questions and Answers (2025 / 2026)(Verified Answers)

1 beoordeling
 5 keer verkocht
  • Vak
  • NR 503
  • Instelling
  • NR 503

NR 503 Week 8 Final Exam Questions and Answers (2025 / 2026)(Verified Answers)Which of the following is a condition which may occur during the incubation period? That's correct! The incubation period is defined as the interval from receipt of infection to the time of onset of clinical illness. Ac...

[Meer zien]

Voorbeeld 4 van de 96  pagina's

Document informatie

  • 11 januari 2024
  • 96
  • 2024/2025
  • Tentamen (uitwerkingen)
  • Vragen en antwoorden

Onderwerpen

  • nr 503 week 8 final exam

Geschreven voor

  • NR 503
  • NR 503

1  beoordeling

review-writer-avatar

Door: gabbymitchell706 • 3 maanden geleden

Verkoper

avatar-seller
TIPSCORE

Ontvangen beoordelingen

Voorbeeld van de inhoud

NR-503-WEEK-8

Question 1
Which of the following is a condition which may occur during the incubation period?
That's correct!
The incubation period is defined as the interval from receipt of infection
to the time of onset of clinical illness. Accordingly, individuals may
transmit infectious agents during the incubation period as they show no
signs of disease that wouldenable the isolation of sick individuals by
quarantine.




Question 2
Chicken pox is a highly communicable disease. It may be transmitted by direct
contact with a person infected with the varicella-zoster virus (VZV). The typical
incubation time is between 10 to 20 days. A boy started school 2 weeks after
showing symptoms of chicken pox including mild fever, skin rash, and fluid-filled
blisters. One month after theboy returned to school, none of his classmates had
been infected by VZV. The main reason was:
That's correct!
The disease is spread by contact with an infected individual who can
transmit the agent (VZV) to immunologically naive persons during the
incubation period and for several days after onset of clinical illness. Since
the boy started school 14 days after showing signs consistent with chicken
pox, it is most likely that hewas no longer infectious.




Question 3
The ability of a single person to remain free of clinical illness following exposure
to aninfectious agent is known as:
That's correct!
Immunity is the capacity of a single individual to avoid disease
susceptibilitywhen exposed to an infectious agent. Herd immunity is a
population characteristic. For certain diseases, individual immunity can be
acquired by vaccination, but this is not true for all infectious diseases.

,Question 4
Which of the following is characteristic of a single-exposure, common-vehicle outbreak?
That's correct!
Single-exposure, common-vehicle outbreaks involve a sudden, rapid
increase incases of disease that are limited to persons who share a common
exposure.
Additionally, few secondary cases develop among persons exposed to
primary cases. A histogram of the outbreak can plot the number of cases
by time of disease onset. In single-exposure, common-vehicle outbreaks, a
log transformation of the time of disease onset will often take on the
characteristicshape of a normal distribution (i.e., a bell curve) with the
median incubation time found at the peak of the curve.

What is the diarrhea attack rate in persons who ate both ice cream and pizza?




That's correct!
The attack rate in this example is defined as the number of persons who
develop diarrhea divided by the total number of people at risk. In this
example, the at-risk group is those who have eaten both ice cream and
pizza. Of these 52persons, 39 developed diarrhea.




Question 6
What is the overall attack rate in persons who did not eat ice cream?




That's correct!
The attack rate is the number of persons with diarrhea (14 + 9) divided by
the total number of persons who did not eat ice cream (40 + 30).

,Which of the food items (or combination of items) is most likely to be the
infectiveitem(s)?

That's correct!
Among persons eating ice cream, over 70% developed diarrhea regardless
of their pizza consumption (39/52 and 11/15). Among both groups of
persons whodid not eat ice cream, each attack rate was equal to or less
than 35% (14/40and 9/30).




Question 8




Which of the following reasons can explain why a person who did not
consume theinfective food item got sick?
That's correct!
Without knowledge as to the specific agent in this instance, it is also likely
that itcan be spread by direct contact with infected persons. Since diarrhea
is a general disease symptom, it is possible that several infectious agents
may be present at this meal or others eaten during the same time period.
Further, information regarding food consumption may have been collected
long after the disease episode. This may have led persons to incorrectly
remember the foodsthat they consumed.




Question 9




An outbreak of gastroenteritis occurred at a boarding school with a
student enrollmentof 846. Fifty-seven students reported symptoms
including vomiting, diarrhea, nausea,and low-grade fever between 10

, p.m. on September 24 and 8 p.m. on September 25.The ill students
lived in dormitories that housed 723 of the students. The table below
provides information on the number of students per type of residence
and the numberreporting illnesses consistent with the described
symptoms and onset time. Calculate the attack rate among all students
at the boarding school.
That's correct!
The answer is found by dividing the total number of cases (57) by the
totalnumber of students (846). This equals 6.7%.




Question 10




An outbreak of gastroenteritis occurred at a boarding school with a
student enrollmentof 846. Fifty-seven students reported symptoms
including vomiting, diarrhea, nausea,and low-grade fever between 10
p.m. on September 24 and 8 p.m. on September 25.The ill students
lived in dormitories that housed 723 of the students. The table below
provides information on the number of students per type of residence
and the numberreporting illnesses consistent with the described
symptoms and onset time. Calculate the attack rates for boys and girls
separately.
That's correct!
For boys, the attack rate includes all cases (40 + 3) divided by the total
numberof students who are boys (380 + 46). The attack rate is 10.1%.

For girls, the attack rate includes all cases (12 + 2) divided by the total
numberof students who are girls (343 + 77). The attack rate is 3.3%.




Question 11

Dit zijn jouw voordelen als je samenvattingen koopt bij Stuvia:

Bewezen kwaliteit door reviews

Bewezen kwaliteit door reviews

Studenten hebben al meer dan 850.000 samenvattingen beoordeeld. Zo weet jij zeker dat je de beste keuze maakt!

In een paar klikken geregeld

In een paar klikken geregeld

Geen gedoe — betaal gewoon eenmalig met iDeal, creditcard of je Stuvia-tegoed en je bent klaar. Geen abonnement nodig.

Direct to-the-point

Direct to-the-point

Studenten maken samenvattingen voor studenten. Dat betekent: actuele inhoud waar jij écht wat aan hebt. Geen overbodige details!

Veelgestelde vragen

Wat krijg ik als ik dit document koop?

Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.

Tevredenheidsgarantie: hoe werkt dat?

Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.

Van wie koop ik deze samenvatting?

Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper TIPSCORE. Stuvia faciliteert de betaling aan de verkoper.

Zit ik meteen vast aan een abonnement?

Nee, je koopt alleen deze samenvatting voor €12,75. Je zit daarna nergens aan vast.

Is Stuvia te vertrouwen?

4,6 sterren op Google & Trustpilot (+1000 reviews)

Afgelopen 30 dagen zijn er 68175 samenvattingen verkocht

Opgericht in 2010, al 15 jaar dé plek om samenvattingen te kopen

Begin nu gratis
€12,75  5x  verkocht
  • (1)
In winkelwagen
Toegevoegd