Yellow Fever Transmission and Origins

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What breakthrough discovery in the late 1920s and early 1930s led to the development of a vaccine for yellow fever?

The yellow fever virus could be grown inside laboratory mice (correct)
The transmission method of yellow fever by female mosquitoes
Monkeys were found to be carriers of the yellow fever virus
The impact of yellow fever outbreaks on society

What was the significance of Dr. Max Theiler's vaccine in protecting people from yellow fever?

It eradicated yellow fever entirely
It provided a safe way to prevent yellow fever infection (correct)
It only benefited monkeys, not humans
It allowed humans to become immune to yellow fever

How did researchers discover that an infected female mosquito can pass the yellow fever virus on to all her offspring?

By noticing transmission patterns in mosquito eggs (correct)
Through observations of the spread of yellow fever among humans
By studying the behavior of monkeys infected with yellow fever
By identifying the role of male mosquitoes in virus transmission

What was a key finding about the yellow fever virus in infected mosquitoes' bodies?

It multiplied within every cell of the mosquito's body (C) Signup and view all the answers

How does a female mosquito transmit yellow fever to a host while feeding on blood?

By secreting infected saliva into the host's wound (A) Signup and view all the answers

Which aspect of yellow fever research directly contributed to the development of a vaccine for humans?

Identifying how the virus spreads within infected mosquitoes (B) Signup and view all the answers

What is the significance of the first three days of a yellow fever patient's illness in relation to mosquitoes?

It is the only time mosquitoes can pick up the infection from the patient. (A) Signup and view all the answers

Why is it impossible to completely eliminate the yellow fever virus?

The virus is carried by mosquitoes and infects monkeys in dense jungles. (C) Signup and view all the answers

What impact did the 1960s yellow fever epidemic in Ethiopia have on the population?

Approximately 30,000 people died during the epidemic. (B) Signup and view all the answers

Why do some people believe insecticides should not be used to kill mosquitoes?

Insecticides can harm the environment. (A) Signup and view all the answers

What happened during a 2008 yellow fever outbreak in Paraguay when there was a shortage of vaccine?

People protested outside clinics demanding vaccinations. (C) Signup and view all the answers

Why do only three companies currently rank as approved yellow fever vaccine producers?

The production of the vaccine requires complex technology available only to a few companies. (B) Signup and view all the answers

What must a female mosquito do in order for its offspring to have the yellow fever virus cells?

Carry the yellow fever virus in every cell of its body (A) Signup and view all the answers

Why is it crucial for a mosquito to bite a yellow fever patient within the first three days of illness?

To transmit the infection to humans (C) Signup and view all the answers

Based on the text, why did some of Dr. Reed's volunteers not contract yellow fever after being bitten by mosquitoes?

Mosquitoes did not carry the germs due to not biting yellow fever patients (D) Signup and view all the answers

Which factor explains why mosquitoes may not be able to infect humans with yellow fever even if they carry the virus?

The time required for the virus to incubate in the mosquito's body (C) Signup and view all the answers

How does the information about yellow fever's transmission time impact efforts to control outbreaks?

It indicates a delayed window for intervention in controlling outbreaks (A) Signup and view all the answers

Why might some individuals exposed to infected mosquitoes not develop yellow fever?

The mosquitoes did not carry the yellow fever virus (C) Signup and view all the answers