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Aside from dengue, the DOH said the rains have also fuelled a spike in influenza-like diseases and cases of leptospirosis, a rat-borne disease that people get when wading in flood waters.

Authorities in the Brazilian state of Rio Grande do Sul have confirmed 54 cases of the waterborne leptospirosis disease after the region experienced unprecedented floods in the months of April and May.

Health experts had previously forecast a surge in infectious diseases including leptospirosis and hepatitis B within a couple weeks of the floods, as sewage mixed into the floodwaters.

Brown rats are known to spread a bacterial disease called leptospirosis, which is caused by bacteria in the urine of infected animals.

Mouse fever isn’t a clinical term, but it appears to be similar to leptospirosis, a bacterial disease that affects humans and animals.