Infectious Disease

Herd Immunity COVID-19

Herd immunity may be impossible without vaccinating children against COVID-19

U.K. coronavirus variant rapidly advancing through the United States

U.K. variant U.S. cases

AstraZeneca vaccine mitigates COVID-19 transmission, data suggests

'COVID tongue' may be another early indication of coronavirus infection

First cases of U.K. coronavirus variant detected in New Jersey

Temple University begins $10 million COVID-19 testing plan

Temple COVID-19 tests

The new COVID-19 variant is now in the United States — here's what is known

New COVID-19 strain

Pennsylvania hospitals face 'dwindling resources' as COVID-19 patients fill ICUs

PA Hospitals COVID-19

Philly surpasses 2,000 COVID-19 deaths, reports more than 1,800 daily cases

Philly 2,000 COVID

Take it from an expert: Dr. Tony Fauci’s hierarchy of safety during COVID-19

What is positivity rate? An explainer on a frequently-cited coronavirus statistic

COVID-19 positivity rate

COVID-19 immunity may persist for years, new research suggests

COVID-19 immunity

'Breakthrough finding' reveals why certain COVID-19 patients die

COVID-19 breakthrough study

Time to discuss potentially unpleasant side effects of COVID shots? Scientists say yes

COVID-19 shot side effects

Pfizer's COVID-19 vaccine has higher effectiveness rate than expected

As COVID-19 cases surge, CDC warns households to take precautions

COVID-19 household transmission

Achieving COVID-19 herd immunity through infection is dangerous, deadly and might not even work

Natural Herd Immunity

Eli Lilly's COVID-19 antibody treatment trial ends early due to ineffectiveness

COVID-19 antibody treatment

7 tips for staying safe as COVID-19 cases rise and colder weather heightens risk

COVID-19 Winter Safety Tips

An epidemiologist explains the new CDC guidance on COVID-19 exposure

CDC COVID-19 guidance

Colleges and the Thanksgiving COVID-19 risk: Fauci’s right – holiday plans may have to change

Thanksgiving College COVID-19

Why males may have a worse response to COVID-19

Men COVID-19 response

When COVID-19 superspreaders are talking, where you sit in a room matters

COVID-19 indoor transmission

New Jersey's COVID-19 contact tracing app now available to download

COVID Alert NJ app

At-home COVID-19 testing now available in Burlington County

Burlington County at-home COVID-19 test

COVID-19 can spread via airborne transmission, revised CDC guidelines say

COVID-19 airborne transmission

We follow laws on seat belts and smoking. Why not on masks?

Face Mask Compliance

How and when will we know that a COVID-19 vaccine is safe and effective?

COVID-19 Vaccine Timeline

Pennsylvania's new coronavirus contact tracing app now available

pennsylvania COVID-19 app

CDC pulls down guidance stating COVID-19 spreads beyond 6 feet

Updated CDC guidance on COVID

The polio vaccine's rollout offers lessons as America awaits a COVID-19 vaccine

Polio Vaccine COVID-19

What a smoky bar can teach us about the '6-foot rule' during the pandemic

COVID-19 6-foot-rule

Why COVID-19 vaccines need to prioritize 'superspreaders'

Steroids reduce death rate of critically ill COVID-19 patients, WHO analysis says

COVID-19 antibodies last longer than previous research showed

Temple's COVID-19 outbreak could spread beyond university, Philly health commissioner warns

Temple COVID Outbreak

How to talk to vaccine skeptics so they might actually hear you

Anti-vaxxers conversations

FDA approves inexpensive COVID-19 test that provides results in 15 minutes

COVID-19 antigen test

New CDC coronavirus testing guidelines draw sharp criticism from health experts

CDC changes COVID-19 testing guidelines

Philly health department warns of COVID-19 outbreak at Tacony church

Philly Church COVID-19

Loss of smell sudden and more severe with COVID-19 than with colds, flu

Loss of smell COVID-19

Pennsylvania plans to launch Irish-made COVID-19 contact tracing app next month

Pennsylvania App COVID

U.S. scientists making coronavirus strain for potential human challenge trials

NIAID coronavirus strain

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Reading for fun boosts well-being and empathy, but children are reading less

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U.S. cancer deaths are down, but early-onset diagnoses keep rising

Just In

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