Unit 5 Part 2 Grade 8 Science Review

Which most accurately describes what makes a mosquito a vector?

A mosquito can spread malaria but not be sick with the disease.

A strain of influenza originates in Southeast Asia and spreads to countries including the United States and Europe, infecting millions of individuals worldwide. Which best describes the spread of this disease?

Epidemic, then a pandemic because it originated in one geographic area before spreading to others.

How are quarantines used to slow the spread of an epidemic?

Quarantines keep infected individuals separate so they cannot pass the disease to others.

Epidemic measles outbreaks were once common, but their occurrence has greatly diminished. Which best explains this?

The measles vaccine has greatly reduced the number of viral infections.

A city has an outbreak of a disease that affects an unusually large portion of its population at the same time. Which term best describes the outbreak?

epidemic

Which is the best way to help prevent the flu from becoming a pandemic?

getting a vaccination

The human immunodeficiency virus (HIV) causes AIDS. The first known human cases AIDS were in Africa in the late 1950s. Since then, tens of millions of people have died from the disease, and tens of millions more people all over the world are infected. Which term best describes the disease AIDS?

pandemic

The bacteria that causes bubonic plague is transmitted to humans by fleas. Which term best describes the role of the fleas in transmitting bubonic plague?

vector

After World War I, an outbreak of the Spanish Flu killed 50 million to 100 million people around the world. Which best describes this occurrence?

Pandemic, because it affected many individuals in multiple countries.

Which aspect of modern life could most likely cause an epidemic to turn into a pandemic?

transportation