anti-parasite drug ivermectin as a preventive measure. The drug is part of the so-called Covid kit of drugs, which also includes the antibiotic azithromycin and the anti-malaria drug hydroxychloroquine. Mr. Bolsonaro’s health ministry has endorsed their use.

Leading medical experts in Brazil, the United States and Europe have said those drugs are not effective to treat Covid-19 and some can have serious side effects, including kidney failure.

“Lies,” Mr. Monteiro, 63, said about the scientific consensus on the Covid kit. “There are so many lies and myths.”

He said medical professionals have sabotaged Mr. Bolsonaro’s plan to rein in the pandemic by refusing to prescribe those drugs more decisively at the early stages of illness.

“There was one solution: to listen to the president,” he said. “When people elect a leader it is because they trust him.”

The mistrust and the denials — and the caravans of Bolsonaro supporters blasting their horns outside hospitals to protest pandemic restrictions — are crushing for medical professionals who have lost colleagues to the virus and to suicide in recent months, said Claudia Franco, the president of the nurses union in Rio Grande do Sul.

“People are in such denial,” said Ms. Franco, who has been taking care of Covid-19 patients. “The reality we’re in today is we don’t have enough respirators for everyone, we don’t have oxygen for everyone.”

Ernesto Londoño reported from Porto Alegre. Letícia Casado reported from Brasília.

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