Merck & Co. (NYSE: MRK) has announced that the Vaxneuvance pneumococcal 15-valent conjugate vaccine has won approval for children 6 weeks through 17 years of age. The vaccine is indicated to protect against infection from Streptococcus pneumoniae serotypes 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 22F, 23F and 33F. The…