Updated COVID-19 mortality rate (most countries have a mortality rate of 5% or lower, with the United States currently at 4.3%.)

Emphasized person-to-person spread as the primary mode of transmission

Noted that some studies indicate the virus may spread between people within 18 feet of each other if there's a breeze

Updated statistics regarding how contagious the virus is (R0)

Expanded the lists of potential symptoms and complications

Updated details about testing and diagnosis

Noted that treatment options are under investigation

Added “avoid close contact” to the steps for prevention

Restructured and updated the content about wearing a cloth face covering to incorporate it in the main steps for prevention

Information condensed and restructured for clarity

Known-risk content updated to reflect the dangers of close contact with symptomatic and asymptomatic persons

Added details on the known-risk exposure-period duration

New details highlighting how exposure risk applies even if both parties are wearing cloth face coverings or personal protective equipment

Updated statistics based on newly available CDC numbers (rather than relying on the Chinese Center for Disease Control and Prevention’s numbers)

Added pregnant people to the list of high-risk groups

Updated COVID-19 Mortality Rate by Age chart—new percentages are based on the combined averages of South Korea, Spain, China, and Italy

Added details on how officials test for COVID-19

Added information about how the “curve” is steepening again as some areas lift restrictions and reopen businesses

Removed information about what individuals can do to “flatten the curve” since the tips were a repeat of recommendations presented elsewhere in the course

Updated the information about international travel to reflect the CDC’s latest guidance (level 3 travel notice)

Updated guidance about traveling within the United States to reflect that many destinations are under “shelter in place” orders

Updated guidance about air travel to reflect that there is an increased risk when flying as opposed to the initial guidance from the CDC that air travel presents a low risk

Updated the list of countries from which foreign nationals cannot depart when traveling to the United States

Added new preventive measures for parents to protect their children

Added a new section on multisystem inflammatory syndrome in children (MIS-C)

Updated language to reflect guidance for keeping customers and employees safe during the reopening of businesses—rather than the preparation of businesses for the pandemic

Added content about high-risk professions that fall outside of OSHA’s “high risk” and “very high risk” categories

Added new tips for maintaining a safe work environment

Updated guidance about what to do if an employee becomes sick at home

Corrected instances where the virus, SARS-CoV-2, was referred to as the illness, COVID-19

Indicated that COVID-19 cases are now present in every state across the United States

Added that the WHO says it’s safe to receive letters and packages from China

Updated which countries are experiencing sustained community spread

Added information about reduced sense of smell and taste as a new, potential COVID-19 symptom

Updated the criteria in the high-, medium-, and low- or no-identifiable risk categories

Updated statistics and other information about the high-risk groups

Updated the introduction to reflect that most travel has been halted, with the exception of emergency situations

Updated the “Should I Travel Within the United States?” Q&A

Updated the “Will I Be Quarantined After International Travel?” Q&A

Added more guidance about getting the workplace ready for a COVID-19 outbreak

Added guidance about how to maintain a safe work environment during COVID-19