Authorities in several West African countries are trying to manage their huge diphtheria outbreaks

A recent CDC report found Idaho is lagging behind the rest of the U.S. when it comes to routine childhood vaccinations. Experts reveal why that may be the case.

Domestic measles cases surged in 2019, with an estimated 1,274 people sick in at least 31 states -- the greatest number of cases reported since 1992, the CDC says.

An expert scientific committee advising the British government recommended for the first time Tuesday that children should be immunized with the chickenpox vaccine — decades after the shots were made widely available in other countries, including the U...

What factors led up to the fumbled rollout of the brand-new RSV shot for babies that has pediatricians worried and frustrated.

A new CDC report published Thursday found 93% of kindergartners met school requirements for childhood vaccinations, lower than the 95% seen pre-pandemic.

The World Health Organization has authorized a second malaria vaccine in a decision that could offer countries a cheaper and a more readily available option than the world’s first shot against the parasitic disease

ABC News medical correspondent Dr. Darien Sutton shares what you should know about getting your COVID-19, flu and RSV vaccines.

ABC News chief medical correspondent Dr. Jen Ashton explains a new study that found one in every six toddlers initiated but did not complete a multi-dose vaccine series.

The CDC issued a Health Alert this week, warning Americans about rising measles cases linked to international travel.

The most important thing is to get vaccinated no matter the circumstances, doctors say.

Pfizer announced Thursday that its vaccine candidate for respiratory syncytial virus was 85.7% effective in preventing lower respiratory tract illness in older adults.

Public health experts tell ABC News which vaccine is used to protect against polio and why most Americans are unlikely to be infected with the disease.

Children in London are being offered polio vaccine boosters after sewage samples with the virus were found in multiple areas across the city.

New York health officials said a patient was infected with vaccine-derived polio. Here's what that means.

The vaccine will mainly be available to healthcare workers and lab personnel.

An independent CDC advisory panel will vote Tuesday on whether to recommend Pfizer's COVID-19 vaccine for children ages 5 to 11 in the U.S.

The vaccination rate nationwide is down to the lowest level since January.

The CDC found a more than 80% decline in HPV infections nationally.

The Pfizer and Moderna vaccines are safe and effective in pregnant and lactating women and those women are able to pass protective antibodies to their newborns.

Clinical studies showed that the one-shot vaccine provides strong protection against COVID-19, including 85% effectiveness against severe illness and preventing 100% of hospitalizations and death.

The British government will begin a new trial to test mixing different types of COVID-19 vaccines, in which participants will receive one dose followed by a second booster shot of a different vaccine.

One-third of parents are delaying immunization

An Illinois pediatrician who died by suicide last year may have forged patient's vaccination medical records, according to investigators.