Brazil's mpox cases top 1,000 as infections concentrate in Rio and São Paulo

Brazil's Health Ministry reported 1,009 confirmed mpox cases in 2026, up about 23% from the 832 cases recorded on November 6, with case counts accelerating in recent weeks. Infections are concentrated in Rio de Janeiro and São Paulo, which together account for roughly 780 of the confirmed cases and lead the national state tallies.

Cases concentrated in Rio and São Paulo

Health ministry data shows Rio de Janeiro and São Paulo together account for roughly 780 confirmed cases — nearly four-fifths of the national total — making them the two states with the most cases in the country. The ministry said it is continuing to monitor the outbreak and will publish updated figures as they come in.

Clade 1b now dominant in parts of Brazil

Genetic sequencing shows that clade 1b has become dominant in parts of Brazil since September, especially in Rio de Janeiro. Mpox is a viral disease spread mainly through close contact; common symptoms include fever, rash and swollen lymph nodes. Anyone who develops symptoms should seek medical care promptly and avoid close contact with others.

(Sources: Brazil's Health Ministry; Particle News.)