Infectious Diseases

Caused by bacteria, viruses, fungi, and other organisms, infectious diseases range from mild to life-threatening. They can be spread from person to person, transmitted by insects or animals, or picked up through contaminated food. Many can be prevented with vaccines.

Featured Stories

CDC Warns COVID Delta Variant as Contagious as Chickenpox and Causes More Severe Illness

"It's one of the most transmissible viruses we know about. Measles, chickenpox, this — they're all up there," said CDC Director Dr. Rochelle Walensky

Father of 5 Dies of COVID: 'I Should Have Gotten the Damn Vaccine'

Michael Freedy had decided to wait a year to get vaccinated because he was concerned about possible side effects

What Is a COVID 'Breakthrough' Infection—And What Should You Do If You Get One?

Getting vaxxed protects people against severe COVID-19. But asymptomatic or mild infections are possible, especially as the Delta variant grips the nation.

Plague Found in 6 Colorado Counties—And Now a 10-Year-Old Has Died from the Disease

Though human cases are rare, Colorado health authorities are cautioning residents to take preventive measures as laboratory testing has confirmed reports of plague in fleas and animals.

More Infectious Diseases

Woman Dies After Contracting 2 COVID Variants at the Same Time

A 90-year-old Belgian woman died five days after she was admitted to a hospital, where she tested positive for two different strains of COVID-19.