He’s making a C. diff-erence.

A Park Slope man is taking his crusade against a deadly infection that annually kills tens of thousands of Americans to Washington, D.C., on Tuesday, where he and more than two dozen other advocates will lobby legislators to pass new laws in the hope of saving lives.

Christian Lillis became a leading figure in the fight to spread awareness of the bacterium known as C. diff after his mother fell ill with the infection following a routine dentist’s visit, and within days perished due to fatal complications caused by the ill-understood germ.

“It was horrific,” said Lillis. “From the time that we took her to the hospital until she was gone was probably 36 hours.”

Read the full story on Brooklyn Paper’s website.