Word: pertussisã
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...Most developing countries also lack the capacity to administer effective care. Coverage rates of the vaccine for dipheria, tetanus, and pertussis??€”despite costing less than a dollar per dose and only having to be administered once—have stagnated at around 50 percent in sub-Saharan Africa since its introduction in the 1970s. Efforts to introduce more complex treatments, including AIDS treatment, encountered the same implementation bottlenecks: a lack of human resources, physical infrastructure, supply chain capacity and managerial oversight...
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