Dhaka: Despite massive culling of poultry, bird flu has spread to another district in Bangladesh, officials said on Friday.

There are currently 42 districts affected out of 64. More than 600,000 birds have been culled across the country since March 2007.

The government has raised compensation for poultry farmers to encourage them to report and kill sick birds.

So far no human infections have been reported in Bangladesh, where there are more than 140 million people.