The U.S. Centers for Disease Control and Prevention (CDC) has not found a link between heart inflammation and Covid-19 vaccines, the agency’s Director Rochelle Walensky said on April 27.

The Covid-19 vaccine developed by Pfizer and BioNTech is effective at preventing symptomatic and severe disease in people with some chronic illnesses, like diabetes and heart disease, the biggest real-world study showed on April 22.

The tenth annual Pharmaceutical Innovation Index, released April 21, sees Eli Lilly top the industry for the first time. The Pharmaceutical Invention Index, a ranking of the industry’s best pipelines, rated Bristol Myers Squibb as No. 1.

Just more than half of U.S. adults have received at least one Covid-19 vaccine dose, data from the U.S. Centers for Disease Control and Prevention showed on April 18, with nearly 130 million people aged 18 years or more having received their first shot.

The United States had administered 205,871,913 doses of Covid-19 vaccines in the country as of the morning of April 17 and distributed 264,499,715 doses, the U.S. Centers for Disease Control and Prevention said.

A U.S. panel will meet again next week to discuss whether the pause on the use of Johnson & Johnson’s Covid-19 vaccine should continue, after delaying a vote on the matter earlier this week.

The Biden administration on April 16 said it will invest $1.7 billion to help states and the U.S. Centers for Disease Control and Prevention fight Covid-19 variants that are rapidly spreading across the United States.

The United States is preparing for the possibility that a booster shot will be needed between nine to 12 months after people are initially vaccinated against Covid-19, a White House official said on April 15.

The first study to directly compare immune reactions between Pfizer’s and AstraZeneca’s Covid-19 vaccines found strong and broadly similar antibody responses in over-80-year-olds after a first dose of either shot, scientists said on April 14.

The pause of Johnson & Johnson’s Covid-19 vaccine will not slow U.S. vaccination efforts, the White House COVID-19 coordinator said on April 13, adding that officials were working to reschedule people with other shots made by Pfizer and Moderna.