Boils are more typical of Marburg virus. Other symptoms similar to Ebola. In any event, I'm thinking it didn't "just spontaneously happen" without some "help".

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September 3, 2023
Trapped Burning Man Attendees Report “Ebola-Like” Illness as the Situation Turns from Bad to Worse
“... there's some sort of virus on the loose at Burning Man that causes boils/vomiting/hemorrhaging. Apparently, that's why they're not letting people in.”

“Things went down the drain” for Burning Man this year, reported popular YouTuber “TheSneezingMonkey.” Some 70,000 attendants of Burning Man, an annual arts and culture festival held in the Black Rock Desert of Nevada, are trapped — and they might be stuck there for days or longer.

Heavy rains turned the desert landscape into a sticky, impassable mudtrap. Vehicles were immobilized, and the community found itself involuntarily committed to staying longer than anticipated.

Text messages sent from the festival hinted at a situation going from bad to worse. One message described attendees as being "terrified," having to deal with flooded tents and scarcity of supplies like food and water. And, according to MSM outlets, one person has also been confirmed to be dead.

Even more alarming, rumors are spreading about an outbreak of an "Ebola-like" illness....

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https://vigilantnews.com/post/trapped-burning-man-attendees-report-ebola-like-illness-as-the-situation-turns-from-bad-to-worse

Lots of social media clips there.