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Why Colin Powell remained vulnerable to COVID-19 despite being fully vaccinated | CBC News
Oct 18, 2021 59 secs
The 84-year-old had been treated over the past few years for multiple myeloma, a blood cancer that impairs the body's ability to fight infections and to respond well to vaccines.

"The more people that are vaccinated, the less we have viral spreading in the community, the less chances of people like him getting infected to begin with," said Dr.

Moreover, people with weakened immune systems because of illnesses like cancer — or cancer treatments — don't always get the same level of protection from vaccinations as healthier people.

Several studies have found as few as 45 per cent of people with multiple myeloma may develop protective levels of coronavirus-fighting antibodies after getting the vaccine.

Centers for Disease Control and Prevention has tracked dips in protection, especially among older Americans who were among the first people vaccinated last winter.

The government has authorized an extra dose of the Pfizer or Moderna vaccines for people with weakened immune systems to try to improve their response.

health authorities urged booster doses of the Pfizer vaccine for everyone 65 and older once they are at least six months past their initial vaccination, along with other people at high risk.

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