Bolivia's confirmed coronavirus infections reached 100,344, the ministry said, and there have been 4,058 deaths since the virus first emerged in the country in early March.

The infections in Venezuela, Brazil and Bolivia, which is seeing a spike in cases, come after Honduran President Juan Orlando Hernandez tested positive in June and was briefly hospitalized.

The three brothers found a black widow and passed it around so it would bite them, according to a Bolivian health official.

A Bolivian military plane crashed on Saturday, killing two crew members and four Spanish citizens who were being transferred before a planned repatriation amid the coronavirus outbreak, the country's Air Force said.

The MIT study prompted Morales, who fled Bolivia first to Mexico and then to Argentina, to call on Sunday for the "democratic" international community to steward the upcoming election carefully.

The incident centres around a group of nine former officials in the government of deposed Bolivian President Evo Morales who sought refuge in the Mexican embassy after Morales stepped down under pressure last month.

Since Monday, Mexico has accused Bolivia's government of ramping up the police presence outside the Mexican embassy in La Paz and of intimidating its diplomats.

Mexican President Andres Manuel Lopez Obrador is also battling record levels of violence, which has caused more friction with the Trump administration.

After Morales left for asylum in Mexico, his own supporters took to the streets in protest.

A date for a new election has not yet been set, but it should be within three months of when the interim government took office following Morales’ resignation.