In the earlier days of the coronavirus pandemic, there was a lot more confusion about whether people should wear masks to protect themselves and others from the virus. Here's why recommendations have changed-even for kids and teens and how they help keep COVID-19 in check. Included is a lesson plan and student viewing guide. [9:00]

Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Describe how viruses were first discovered and how they are detected
Discuss three hypotheses about how viruses evolved
Describe the general structure of a virus
Recognize the basic shapes of viruses
Understand past and emerging classification systems for viruses
Describe the basis for the Baltimore classification system

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

This site from the Centers for Disease Control and Prevention has information on yellow fever. The site is broken into the following sections: Yellow Fever Disease, Yellow Fever Vaccine Requirements, Yellow Fever Precautions, and Risk for Travelers.

Anything and everything you could think to ask about Hepatitis A, from general to specific. Questions and answers are clear and concise.

What do bats have to do with coronaviruses? As it turns out, the adaptation to flight may be what turned bats into perfect virus reservoirs. One of these viruses, the new coronavirus, likely jumped the species barrier to humans causing the initial 2019 outbreak in China. This pathway explores the outbreak from the perspective of medical professionals working to accurately diagnose and treat patients, scientists racing to understand the source of the outbreak, and public health officials implementing solutions to control its spread.

Bacterial conjugation and experiments with viruses indicated that they must also contain DNA. This multimedia article includes animations, pictures, video, biographical information, and quiz questions that are accessed by clicking on buttons along the bottom of the page.

Examine the contrasting approaches taken by South Korea and the United States with respect to diagnostic testing as a tool to contain the spread of COVID-19, in these videos from The Virus: What Went Wrong? Use this resource to learn about the benefits of aggressively responding to a disease outbreak and consider the public health consequences of failing to do so. [12:56] This site includes 3 video segments.

Explore the reasons for the U.S. government's unsuccessful response to the initial spread of COVID-19, in these three videos from The Virus: What Went Wrong? | FRONTLINE. Use this resource to examine executive leadership in a time of national crisis. [7:40]

Learn about the origins of COVID-19 in these videos from The Virus: What Went Wrong? | FRONTLINE. Use this foundational resource to examine the timeline of the outbreak in China, and explore both cultural and systemic factors that enabled its spread during the first few months after the first case was identified. [7:12]

This video describes the role of the brain in regulating body temperature and how sometimes fever is employed to fight off infection.

This lesson describes the major components and functions of the immune system and the role of engineers in keeping the body healthy (e.g., vaccinations and antibiotics, among other things). This lesson also discusses how an astronaut's immune system is suppressed during spaceflight due to stress and other environmental factors.

If a computer is connected to the internet and is not protected from computer viruses and spyware, then it is only a matter of time before the computer is infected. This article describes the symptoms of an infected computer and the steps one can take to repair it.

This video introduces how HIV enters the host cell, how it co-opts the cellular machinery to reproduce, and how to fight HIV infection.

This video explains how HIV enters the host cell, how it co-opts the cellular machinery to reproduce, and how to fight HIV infection.

This resource provides information about influenza, the flu shot, and who should get one.