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Background Info: WHO/Chikungunya virus (CHIKV).


Key facts
Chikungunya is a viral disease transmitted to humans by infected mosquitoes. It is caused by the chikungunya virus (CHIKV).
A CHIKV infection causes fever and severe joint pain. Other symptoms include muscle pain, joint swelling, headache, nausea, fatigue and rash.
Joint pain associated with chikungunya is often debilitating, and can vary in duration.
There is currently no vaccine or specific drug against the virus. The treatment is focused on relieving the disease symptoms.
The disease mostly occurs in Africa, Asia and the Indian subcontinent. However a major outbreak in 2015 affected several countries of the Region of the Americas, and sporadic outbreaks are seen elsewhere.
The disease shares some clinical signs with dengue and Zika, and can be misdiagnosed in areas where they are common.
Severe cases and deaths from chikungunya are very rare and are almost always related to other existing health problems.
Due to the challenges in accurate diagnosis for chikungunya, the is no real estimate for the number of people affected by the disease globally on an annual basis.
The proximity of mosquito breeding sites to human habitation is a significant risk factor for chikungunya.

As in previous years, Asia and the Americas were the regions most affected by chikungunya. Pakistan faced a persistent outbreak that started the previous year and reported 8 387 cases, while India suffered with 62 000 cases. In the Americas and the Caribbean were reported 185 000 cases; the cases in Brazil accounted for >90% in the region of the Americas. Chikungunya outbreaks were also reported in Sudan (2018), Yemen (2019) and more recently in Cambodia and Chad (2020)
Full TXT
https://www.who.int/news-room/fact-sheets/detail/chikungunya

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from https://outbreaknewstoday.com/chikungunya-in-brazil-cases-up-32-in-2021/:
According to the latest data published by the Pan American Health Organization ,
cases of chikungunya increased by 32% in Brazil in comparison between 2020 and 2021.

Through November 27 of this year, 127,487 total cases of the disease, caused by a
virus and transmitted by the bite of the Aedes aegypti mosquito, had been registered.
This compares with 96,044 reported during the same period in 2020.

The Northeast region continues to be the most affected, with an incidence of 111.7
cases per 100,000 inhabitants. But the increase of affected people in other parts
of the country is also noteworthy, such as the Southeast, which reported 29.1
cases per 100,000 individuals.

In São Paulo alone, the number of people affected by chikungunya jumped from
281 in 2020 to 18.2 thousand in 2021, which represents an increase of more than 6,000%.