FILE PHOTO: Enrique Ramezi, 56, receives a coronavirus disease (COVID-19) vaccination at the LA Mission homeless shelter on Skid Row,
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Biotechnology & Medical Research (NEC) (TRBC level 5)
Pfizer says South African variant could significantly reduce protective antibodies
(This February 17 story corrects headline and first paragraph to show the reduction was in the protective antibodies elicited by
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