Merck’s CAPVAXIVE™ (Pneumococcal 21-valent Conjugate Vaccine) Demonstrates Positive Immune Responses in Adults with Increased Risk for Pneumococcal Disease October 16, 2024 by | RAHWAY, N.J.–(BUSINESS WIRE)—- $MRK #MRK–Merck’s CAPVAXIVE (Pneumo. 21-valent Conjugate Vaccine) Demonstrates Positive Immune Responses in Adults with Increased Risk for Pneumococcal Disease