China's factory activity contracted unexpectedly in July after bouncing back from COVID-19 lockdowns the month before, as fresh virus flare-ups and a darkening global outlook weighed on demand, a survey showed on Sunday.

The official manufacturing purchasing managers' Index (PMI) fell to 49.0 in July from 50.2 in June, below the 50-point mark that separates contraction from growth, the National Bureau of Statistics (NBS) said.

Analysts polled by Reuters had expected it to improve to 50.4.