BRASILIA - Brazil’s health minister said on Wednesday that the country’s attempts to purchase thousands of ventilators from China to fight a growing coronavirus epidemic had fallen through and the government is now looking to Brazilian companies to build the devices.

“Practically all our purchases of equipment in China are not being confirmed,” Minister Luiz Henrique Mandetta said at a news conference.

An attempt to buy 15,000 ventilators in China did not go through and Brazil was making a new bid, he said, but the outcome is uncertain in the intense competition for medical supplies in the global pandemic.

In one positive sign for Brazil’s supply crunch, a private company managed to buy 40 metric tons of protective masks from China, with the shipment arriving by cargo plane in Brasilia on Wednesday.

Young women boxes with donations of food distributed by an NGO to people suffering during the COVID-19 outbreak at the Cidade de Deus (City of God) favela in Rio de Janeiro, Brazil on April 7, 2020.

The purchase of 6 million masks worth 160 million reais ($30 million) was undertaken by pharmaceutical and hospital equipment company Nutriex, based in Goiania, 220 kilometers east of Brasilia. The firm plans to donate part of the order.

Health authorities began to sound the alarm this week over supply shortages as hospitals faced growing numbers of patients with COVID-19.

Confirmed cases of coronavirus in the country soared to 15,927 on Wednesday, with the death toll rising by 133 in just 24 hours to 800, the ministry said.

Rio de Janeiro reported the first six deaths in four of the city’s hillside slums, called favelas, alarming authorities who fear rapid contagion in crowded communities that have limited access to medical care and often lack running water for hygiene.

Two of the deaths occurred in Rocinha, one the largest slums in South America where more than 100,000 people live.

Mandetta reported the first case of coronavirus among the Yanomami people on the country’s largest reservation and said the government plans to build a field hospital for indigenous tribes that are vulnerable to contagion.

“We are extremely concerned about the indigenous communities,” Mandetta said.

Anthropologists and health experts warn that the epidemic can have a devastating impact on Brazil’s 850,000 indigenous people whose lifestyle in tribal villages rules out social distancing.

President Jair Bolsonaro said in an address to the nation that the anti-malaria drug hydroxychloroquine was saving lives of coronavirus patients and should be used in the initial stages of COVID-19. Due to the absence of scientific evidence on its effectiveness and safety, Brazil’s health authorities limit its use to seriously ill patients who are in hospital.

Mandetta said Brazil has hired local unlisted medical equipment maker Magnamed to make 6,000 ventilators in 90 days.

Pulp and paper companies Suzano SA and Klabin SA, planemaker Embraer SA, information technology provider Positivo Tecnologia SA and automaker Fiat Chrysler have also offered to help build ventilators, he said.