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Intensifying battle over booster shots. >> reporter: tonight, pfizer and now moderna are making a major push for booster shots, but the food and drug administration is staying neutral. today, the f.d.a. released new documents from pfizer ahead of an advisory panels meeting on friday to discuss covid booster shots, claiming that protection from its vaccine loses some effectiveness after six months, but improves to 95% after a third dose. but in a separate document, f.d.a. staff noted that theyve ...