Relax and read the WHO fact sheet:

https://www.who.int/news-room/fact-sheets/detail/chikungunya which states (among other things):

"Severe symptoms and deaths from chikungunya are rare and usually occur in young babies or elderly people with other coexisting health problems."

FWIW the article title on HN is wrong in several ways!

That title, "CDC travel notice for outbreak deadly incurable mosquito virus reaches Americas" is nonsensical.

What DID happen: "the CDC issued a Level 2 travel advisory for Costa Rica, urging US citizens to ‘practice enhanced precautions’ as chikungunya plagues the Guanacaste Province."

The actual article title that HN links to:

"CDC issues travel notice for tropical hot spot as outbreak of deadly incurable mosquito virus reaches Americas".

is also wrong.

"The Americas" are a landmass comprising North and South America, spanning the Western Hemisphere and encompassing diverse cultures, climates, and histories.

Chikungunya traces back to (first case) Tanzania, Africa in 1952. The chikungunya virus first spread to the Americas in late 2013. The first local transmission was identified in Caribbean countries, with the first locally-acquired infections reported from St. Martin in December 2013. This outbreak led to approximately 1.1 million reported cases within a year. (It is often a painful disease.)

Anyway, to summarize, contrary to OP's title neither the CDC travel notice nor the disease chikungunya reached the Americas recently.

Furthermore, chikungunya is not considered a deadly disease. Chikungunya has been in the USA on and off for at least 14 years, though it is not endemic to the USA.

Relax! Chill! Enjoy a gin-and-tonic in the heat in celebration of man's tenuous victory(?) over malaria thanks to the cinchona tree of Peru and it's derivative quinine.