The newswire business seems the hot place to be.

PR Newswire has just announced the acquisition of U.S. Newswire, which focuses on press release distribution in the government and public interest sectors. The price: $19 million in cash and up to an additional $4 million based on future performance.

This comes just two months after PRWeb, the online press release distributor, said it was being acquired by PR software producer Vocus for $28 million in cash and stock. And it follows less than a week after PRWeb announced a distribution partnership with Business Wire, perhaps PR Newswire's No. 1 competitor.