Yellow fever is not "for" anything; it is a dangerous viral disease. According to the provided reference, it is caused by a virus transmitted by infected mosquitoes, primarily found in tropical regions of Africa and South America.
Since the question "What is yellow fever for?" is based on a flawed premise, a better question to answer, based on the available information, might be:
What is Yellow Fever?
Yellow fever is a serious illness with potentially severe consequences. It is caused by a virus spread through mosquito bites.
Symptoms of Yellow Fever
The most common symptoms, as stated in the reference, include:
- Fever
- Muscle pain, especially backache
- Headache
- Loss of appetite
- Nausea or vomiting
Regions Affected
Yellow fever is most prevalent in certain tropical countries within:
- Africa
- South America
Transmission
The primary mode of transmission is through the bite of infected mosquitoes.
