Antimalarial drug quality in the most severely malarious parts of Africa - a six country study.

However, there was an apparent trend in that failing products more often originated or were claimed to originate from poorer parts of the world with weaker regulatory systems: failure rates were 48% (30/63) for Africa, 32% (29/90) for Asia and 24% (12/50) for Europe (See Table 2 ).

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