Data visualization 2017

New measles cases decline in U.S., but the outbreak isn't over yet

Data: Centers for Disease Control and Prevention; Chart: Harry Stevens/Axios

U.S. measles cases have been dropping over the past couple of weeks, with 7 cases reported the week ending Sept. 5. Only 2 of those cases were new illnesses, the Centers for Disease Control and Prevention announced Monday.

Why it matters: Most cases are in unvaccinated people, whose infections often originated from travelers from countries where "large measles outbreaks are occurring," CDC said. And while the numbers here have dropped, it only takes one unvaccinated group for the extremely contagious virus to establish a new foothold.

States are upping their reliance on wind power

Adapted from an American Wind Energy Association report; Cartogram: Axios Visuals

Four states now generate at least 30% of their electricity annually from wind, now that Oklahoma and Kansas have joined Iowa and South Dakota on the 2017 list. That's one factoid from the American Wind Energy Association's annual report on the state of the wind power market.

Why it matters: It's a data point that underscores the growth of renewables in U.S. power markets. The chart above shows the penetration of utility-scale wind nationwide.