Archived articles

Epidemiology

Q+A

Excess deaths show the true impact of COVID-19 in the U.S.

Published Sept 1, 2020

Epidemiologist Justin Lessler unpacks a recent CDC report on comorbidities and coronavirus deaths that is being misinterpreted on social media

Face mask with American flag pattern against red background

Mask hysteria?

Wearing a mask protects you and those around you

Published Aug 24, 2020

New research co-led by a Johns Hopkins researcher suggests face coverings reduce viral exposure, limiting both transmission and severe disease. But is that evidence enough to turn the tide of public opinion now that masks have become politicized?

Sign on a lab door reads 'Do Not Enter: COVID-19 Testing'

Q+A

Asymptomatic spread makes COVID-19 hard to contain

Published May 12, 2020

Immunologist Gigi Gronvall discusses the challenges of tracing the spread of coronavirus, the importance of testing, and the dangerous appeal of "immunity passports"

Q+A

The long road to herd immunity

Published April 30, 2020

Achieving herd protection can stop the spread of an infectious disease within a population, but as Bloomberg School experts explain, the U.S. is nowhere near that point with SARS-CoV-2, and getting there could prove difficult

COVID-19

Hopkins team launches temperature-tracking study and app

Published April 30, 2020

The app, now available in the Apple App Store and on Google Play, will help reveal health trends and potential disease outbreaks

A health worker checks a man's temperature before he enters a hospital in China

Public health

Study provides key insights on COVID-19 spread

Published April 28, 2020

Analysis of data from Shenzhen, China, shows how extensive testing and contact tracing stopped the outbreak in a southern Chinese megacity

Epidemiology

JHU offers free COVID-19 course

Published March 27, 2020

The class is offered publicly on Coursera and requires no prior background in science or health fields

Coronavirus

Study: COVID-19 symptoms start about five days after exposure

Published March 9, 2020

Bloomberg School study suggests a median incubation period of 5.1 days for the new coronavirus, affirming the 14-day quarantine used by the CDC and other health authorities