Choose the correct answer for each question. The incorrect options are all based on myths many people actually believed (or still do) about infectious disease.
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1. What causes plague?
A rank vapour from decaying matter called 'miasma'
Sinfulness
Jews
The bacterium Yersinia pestis
2. How is plague spread?
Fleas carry the plague, and the rats carry the fleas. People thought cats and dogs caused plague, and were paid bounties for killing them. This caused rat numbers to shoot up and worsen the plague.
Via miasma through the air
Via mangey cats and dogs
Via flea bites
Via rat bites
3. What is the best way to treat plague?
The other treatments were all widely used throughout Black Death, and only did more harm
Bloodletting the buboes
Whipping yourself and praying
Barricading sufferers in their homes
Antibiotics
4. How is Cholera spread?
John Snow discerned Cholera was water-borne in the 1850s
The pneumonic form of the plague is spread by droplets - therefore "through the air" is a correct answer. Also catching malaria does afford some degree of immunity, which is why it is generally so much more serious in children (8% of child deaths globally caused by malaria). I think that it is unfair to mark these two answers "wrong".
Thanks I'll make the plague one clearer, but it is a common misconception that you automatically become fully immune to malaria if you've had it once which is not the case.