Obviously, it's nowhere near as dangerous as it was centuries ago, but officials warn it still needs to be taken seriously.
UPDATE: What to know about plague after South Lake Tahoe resident tests positive for disease
Health officials in El Dorado County believe the person got it from a flea bite while camping.
Human plague cases are rare.
The CDC says an average of seven people a year catch the plague across the country.
It's treated with antibiotics.
Health officials say the person in El Dorado County is recovering at home.