Nearly all hunger-related deaths are due to the political environment they live in (including wars). Of course such environments also disproportionately include those who cannot gain access to antibiotics as well.
You could argue that vaccines would be hampered by the same environmental issues, but the window of stability necessary to vaccinate a person for life is much smaller and easier than the repeated stability moments required to gain access to antibiotics in a timely fashion for those infected with Strep A.
The question of prioritization of resources is not merely dependent upon the number of those affected, the creation of an effective vaccine is unpredictable. You're better off taking a broad approach in order to maximize the likelihood of success.
You could argue that vaccines would be hampered by the same environmental issues, but the window of stability necessary to vaccinate a person for life is much smaller and easier than the repeated stability moments required to gain access to antibiotics in a timely fashion for those infected with Strep A.
The question of prioritization of resources is not merely dependent upon the number of those affected, the creation of an effective vaccine is unpredictable. You're better off taking a broad approach in order to maximize the likelihood of success.