Although in this era of modern biotechnology, especially for a 3rd World targeted vaccine, it would be appalling to develop one that was expensive to manufacture. I.e. nothing like the standard old flu vaccine, which is grown in the membranes of chicken eggs, yielding about 3 doses from each egg. Compare to e.g. the Protein Sciences method, which uses genetically modified insect cells in a bioreactor, which as I recall produces about 100,000 doses in a week or so (although it normally takes another 5-7 weeks to finish the vaccine once a batch of raw antigen is done).