A Planet of Viruses audiobook cover - Why one of the best science thinkers alive says viruses are essential for life

A Planet of Viruses

Why one of the best science thinkers alive says viruses are essential for life

Carl Zimmer

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ScienceHealth & Nutrition

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A Planet of Viruses
The Common Cold+
Influenza+
Beneficial Viruses+
Historical Epidemics+
Unpredictable Threats+
Treatment Misconceptions+

Quiz — Test Your Understanding

Question 1 of 7
Why might we not want to completely cure the common cold even if we had the ability to do so?
  • A. The rhinovirus helps teach our immune systems to handle benign infections, preparing it for deadlier threats.
  • B. Eradicating the rhinovirus would cause endogenous retroviruses to overpopulate our cells.
  • C. The common cold virus directly attacks and consumes harmful bacteria in our respiratory tract.
  • D. The rhinovirus produces syncytin, a protein essential for human reproduction and survival.
Question 2 of 7
What primary characteristic of the influenza virus makes it so difficult to cure?
  • A. It is a single, highly resilient virus that resists all known antiviral medications and antibiotics.
  • B. It exists as many different types of viruses that are constantly evolving and swapping genes.
  • C. It hides dormant in the host's DNA for decades before suddenly attacking the immune system.
  • D. It primarily infects marine life before mutating and transferring to human populations through water.
Question 3 of 7
How do marine bacteriophages play a crucial role in protecting human and environmental health?
  • A. They oxygenate the ocean, preventing airborne pathogens from surviving near coastlines.
  • B. They consume 15 to 20 percent of ocean bacteria daily, preventing illnesses like cholera from spreading.
  • C. They fuse with the DNA of marine animals, preventing the spread of bird flu to oceanic ecosystems.
  • D. They produce proteins that humans harvest to create vaccines for water-borne diseases.
Question 4 of 7
According to the text, what surprising benefit do endogenous retroviruses provide to humans?
  • A. They produce a protein called syncytin, which is essential for the formation of the placenta.
  • B. They destroy dysentery-causing bacteria in the human digestive tract.
  • C. They act as a natural defense mechanism against mosquito-borne illnesses like West Nile virus.
  • D. They filter harmful pathogens out of the air we breathe by reinforcing the airway membranes.
Question 5 of 7
Why is investigating the evolutionary history of viruses like HIV important for modern medicine?
  • A. It allows researchers to synthesize the virus from scratch to create biological weapons.
  • B. It proves that all modern viruses originated during the early twentieth century.
  • C. It helps scientists retrace the virus's evolution, allowing them to uncover weaknesses in its structure.
  • D. It reveals that viruses only become deadly when they are transferred from birds to humans.
Question 6 of 7
Why have outbreaks of viruses like Ebola become more widespread and dangerous in recent years compared to the 1970s?
  • A. The virus has mutated to survive in warmer, wetter climates across North America.
  • B. Increased connectivity and globalization allow the virus to travel rapidly from previously isolated regions.
  • C. The virus has learned to swap genes with the influenza virus, making it highly contagious through the air.
  • D. Widespread use of antibiotics has caused the Ebola virus to mutate into an untreatable strain.
Question 7 of 7
Why is it dangerous and ineffective to take antibiotics to treat the common cold?
  • A. Antibiotics suppress the immune system, making the body more susceptible to the rhinovirus.
  • B. Antibiotics only target bacteria, and using them unnecessarily can create resistant, untreatable strains of bacteria.
  • C. Antibiotics destroy the beneficial bacteriophages in the bloodstream that naturally fight off the cold.
  • D. Antibiotics cause the common cold virus to mutate into more severe respiratory illnesses like influenza.

A Planet of Viruses — Full Chapter Overview

A Planet of Viruses Summary & Overview

A Planet of Viruses (2011) takes you on a whirlwind tour into the hidden world of viruses. You’ll discover how our understanding of these tiny, abundant organisms has evolved over time and how our lives are influenced by them, from their power to kill to their protective properties.

Who Should Listen to A Planet of Viruses?

  • Anyone curious about where diseases come from
  • Anyone interested in biology
  • Anyone interested in the science behind medical treatments of viruses

About the Author: Carl Zimmer

Carl Zimmer is a columnist for the New York Times and a lecturer at Yale University, where he teaches how to write about science and the environment. He writes for National Geographic and is the author of thirteen books, including Parasite Rex and Microcosm.

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