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MONDAY, Jan. 24, 2022 (HealthDay News) -- For health care workers who received a priming dose of the Ad26.COV2.S vaccine, Ad26.COV2.S and mRNA boosters are immunogenic, with the strongest responses after boosting with an mRNA-based vaccine, according to a study published online Jan. 19 in the New England Journal of Medicine.

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FRIDAY, Jan. 21, 2022 (HealthDay News) -- The risk for hospitalization for COVID-19 among older Americans is far higher for those who are unvaccinated than for those who are fully vaccinated and have had a booster shot, new government data show.

MONDAY, Jan. 17, 2022 (HealthDay News) -- Residents of nursing homes have been a particularly at-risk group throughout the pandemic, and the advent of the fast-spreading Omicron variant has them facing another wave of infections and deaths, new data shows.

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FRIDAY, Jan. 14, 2022 (HealthDay News) -- Full COVID-19 vaccination, including third doses and/or boosters, is recommended for all patients with cancer, with a strong preference for mRNA vaccines, according to expert consensus recommendations published by the National Comprehensive Cancer Network (NCCN).

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MONDAY, Jan. 10, 2022 (HealthDay News) -- Severe COVID-19 outcomes are rare after primary vaccination, but those who are 65 years or older, are immunosuppressed, or have underlying conditions may be at increased risk, according to research published in the Jan. 7 issue of the U.S. Centers for Disease Control and Prevention Morbidity and Mortality Weekly Report.

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FRIDAY, Jan. 7, 2022 (HealthDay News) -- Citing the rapid spread of the omicron variant and the need for protection against it, U.S. federal health officials are shortening the recommended time between the second dose of the Moderna vaccine and a booster shot from six months down to five.

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TUESDAY, Jan. 4, 2022 (HealthDay News) -- The U.S. Centers for Disease Control and Prevention on Tuesday backed the emergency use approval of the Pfizer COVID-19 booster shot for high-risk children between the ages of 5 and 11 years, along with shortening the time period between a second dose and a booster shot from six months to five months.