Opposition leader Chakwera has been pronounced the winner with 2.6 million votes, while incumbent president Mutharika has taken 1.75 million and underdog candidate Kuwani over 32,400.
The judiciary cancelled President Peter Mutharika's narrow win in February over "systematic and grave" irregularities. Mutharika, who has been in power since 2014, called the ruling a "coup".
Hundreds fled quarantine centres in both countries, officials say, with some escapees saying they had bribed police.
The Human Rights Defenders Coalition argued that the government had failed to announce any measures to cushion the poor during the lockdown.
Malawi President Peter Mutharika said he ordered the treasury to cut his own salary and the wages of his ministers and deputy ministers by 10 percent for three months and direct the money towards the fight against the novel coronavirus.
Health officials plead for global solidarity for helping the poor continent at a time when even some of the world’s richest countries are scrambling for basic medical needs, including face masks.
In Africa, authorities claim they have been "spared by God" or have simply been saved by the low volume of air traffic to their countries. However, some fear it is simply a lack of testing.
A joint effort will be required to overcome the potential spread of the pandemic on the African continent.
The World Health Organization has vaccinated more than 15,000 children in Africa against malaria. But did they do so with consent, or were the children part of a research project?
After marathon six-month hearings broadcast on public radio, the court on Monday declared that Mutharika was "not duly elected."
Mutharika, who will remain president until the fresh polls, has the right to appeal the verdict, which is expected to stoke turmoil in the normally peaceful southern African country.
Amid heightened tensions, both Malawi officials and the international community are urging people across the country to uphold the rule of law and remain calm.
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