PIERRE - There were no additional cases of human West Nile virus in South Dakota in the past week.

The transmission season for the sometimes-fatal virus is coming to an end and will be over with the first hard freeze that kills mosquitoes, which transmit the disease to humans.

Thirty-five human cases have been reported this year. If that number doesn't change, it would be the fewest human cases for one summer since the virus was discovered in South Dakota in 2002.

There were 208 human infections and six deaths last year.