China appears to have scaled back the anti-mosquito treatment rules imposed on imports from the US in an attempt to prevent spread of the Zika virus.

The latest update from the Department of Agriculture's Foreign Agricultural Service now says cargo vessels originating from the US – other than the state of Florida – no longer require disinsection certification to show they have been treated to kill mosquitoes, their larva and eggs.

However, if during the course of routine sampling and inspection, local officials discover any adult mosquitoes, eggs, larva or infected cases, the vessel and its contents will be subject to the full zika requirements. Also, if a vessel loads or unloads in Florida or a zika-infected country, it is subject to the full requirements.

The move comes after China's General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) determined there was a low risk of zika transmission through shipments of cargo. 

China's requirements for shipments from zika-infected countries were detailed on just-style last month:

Update on anti-mosquito rules for exports to China