COVID-19 update for May 24: Pfizer says 3 shots elicits good immunity for children under 5 | mRNA vaccine response stronger after fourth dose vs third
A fourth dose of a COVID-19 mRNA vaccine can boost antibodies and other immune responses to levels higher than those seen after the third dose, according to U.K. trial data.
Researchers cautioned that all of the increases “will probably wane rapidly, as has been observed after third doses.” Participants with high levels of immune responses before the fourth dose had limited boosting from that shot, they said, which suggests there may be a “ceiling” to the booster effect and that people with high antibody levels “are unlikely to gain much boosting from additional doses.
. Women should not delay their mammograms for extended periods, the Society for Breast Imaging now says.Article contentdirected at asymptomatic, average risk women with no history of breast cancer or lymph node cancer, the group now advises that if screening mammograms show the kind of lymph node abnormalities associated with the vaccines, the exams should be repeated six months later.
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