UPDATE 1-CDC says 14,000 people at risk of meningitis amid call for criminal probe

* CDC says 14,000 people at risk of infection

* Death toll rises to 14; total sickened jumps to 170

* Influential U.S. senator calls for federal probe

(Adds CDC reports of deaths, sickened, calls for an investigation)

NASHVILLE, Tennessee, Oct 11 (Reuters) - U.S. health authorities said on Thursday that more people than earlier thought received possibly tainted steroid injections and some 14,000 patients could be at risk of contracting meningitis in an unprecedented outbreak of the disease.

The U.S. Centers for Disease Control said the number of people at risk, which is 1,000 higher than earlier estimated, was revised after consulting with health authorities.

Fourteen patients have died from meningitis and 170 people have been infected, the CDC said in its latest update on Thursday. The number of infections ballooned by 33 since Wednesday, CDC said.

Florida reported a second death from meningitis and Indiana reported its first death from the outbreak. Meningitis cases have been confirmed in 11 states.

(Additional reporting by David Morgan; Writing by James B. Kelleher and David Bailey; Editing By Greg McCune and Vicki Allen)