For many people with weakened immune systems, vaccines have not offered the same degree of relief and return to normalcy as they have for those with no underlying health conditions.

Fatal breakthrough Covid-19 infections among people who have been fully vaccinated, like former Secretary of State Colin Powell, are rare.

What led to Bill Clinton's hospitalization? A common health issue

A Virginia girl died of Covid-19 complications days after she started showing symptoms, according to her parents, who said she may have been exposed as a result of being classroom "nurse."

Pfizer called the request "an important step in our ongoing effort" against Covid-19.

Pfizer said the request "is an important step in our ongoing effort against #COVID19."

The Virginia school district is investigating the claim that she was asked to escort sick children to the nurse's office.

Exhausted amid hospital staff shortages and emotionally depleted, health care workers are also facing growing skepticism and rage from patients.

Knowing someone who became seriously ill or who died of Covid was another major reason cited, according to the Kaiser Family Foundation survey.

"Most people who are pregnant are generally young and generally healthy, so they don’t really expect that if they were to get this infection that they could be as sick as we are seeing," one doctor said.

Exclusive: Samantha Wendell was worried the vaccine would affect her fertility. Instead of attending her wedding, her family is now planning her funeral.