Riley I D, Tarr P I, Andrews M, Pfeiffer M, Howard R, Challands P, Jennison G
Lancet. 1977 Jun 25;1(8026):1338-41. doi: 10.1016/s0140-6736(77)92552-1.
A double-blind controlled trial of a 14-valent pneumococcal polysaccharide vaccine was carried out in 11 958 adults at Tari in the Papua New Guinea Highlands. Pneumococcal infection, confirmed by blood-culture and lung aspirate, was less in the vaccinated group by 84%. Mortality from pneumonia was less by 44%.