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But most importantly, when an effective treatment became available, it was disseminated worldwide, and part of that happened because isoniazid was unpatentable, so costs for producing it and treating people with it remained low.

Apolisi, together with a physician colleague, ensures that children in close contact with her TB patients take the daily preventive medication isoniazid for at least six months, as recommended by the WHO.

Standard TB preventive treatment requires taking isoniazid every day for 6 months to 3 years.

For decades, the standard course has been an antibiotic called isoniazid that kills the bacteria causing TB only when they are replicating.

The standard treatment for latent TB at the moment is a lengthy course of isoniazid – for nine months in north America.