(Reuters) - UK's Smiths Group on Wednesday upgraded its annual organic revenue growth outlook after the engineering firm posted a 15.8% rise in first-quarter revenue.

The company now expects full-year organic revenue growth of 5%-7%, up from the original 4%-6% guidance.

(Reporting by Shanima A and Chandini Monnappa in Bengaluru; Editing by Subhranshu Sahu and Janane Venkatraman)