, 3
4 When the number of people in a population that are immune to a disease reaches a herd
immunity threshold (HIT) value then the disease is no longer present in that population.
The table shows data for four diseases, A to D, in a population of 50 000 people.
Disease Number of people with Herd immunity threshold (%)
immunity to the disease
A 44 000 92–94
B 38 000 83–86
C 39 000 80–96
D 41 000 75–86
Which of the diseases is no longer present in this population?
Your answer
[1]
5 The diphtheria vaccine contains a bacterial toxin that results in the production of antibodies when
injected into the body.
Which type of immunity is provided by the diphtheria vaccine?
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 Revisionbae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.