In the first three months of 2022, 99 probable cases of leptospirosis were registered in Petrópolis, compared to only three reports in the same period of 2021. The region was hit by heavy rains and flooding in February 2022, which increased again in recent days.

Leptospires are bacteria that can be transmitted via the urine of rodents (especially rats). This can happen, for example, when wading through contaminated rivulets, puddles or mud. Transmission to humans occurs via small skin lesions or mucosal contacts through direct or indirect contact with rodent urine. Symptoms of the disease range from flu-like general symptoms, headache, high fever to blood poisoning. Antibiotic treatment is necessary to prevent complications and accelerate healing.