According to the sources, the vaccine will be much more affordable than existing ones manufactured by two foreign companies. India's drug regulator in July had granted market approval for the Pneumococcal Polysaccharide Conjugate vaccine, after reviewing the phase 1, 2 and 3 clinical trial data submitted by the Pune-based firm.
Some critics contend that Japan's rush to secure supplies is driven largely by a political desire to show the world it is fully committed to hosting the Games.