The UN's health agency has faced criticism in the past both for overreacting and for moving too slowly in fighting epidemics, but it has rarely faced as much scrutiny as with the COVID-19 pandemic.
Nelson Chamisa, who lost to ruling ZANU PF's Emmerson Mnangagwa by a narrow margin, vows to challenge what he says is a "fraudulent" and "illegitimate" election.
More than 10,000 people, mostly from the ethnic Gayo community, took part in the performance, stressing the need to conserve a threatened national park in the westernmost province.
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