The number of swine flu cases across the country climbed upto 17 today as the Union Health Ministry warned of a spurt in number of cases after monsoon.

"They say that the H1N1 group of viruses proliferate more when the weather is slightly cooler," Health Secretary Naresh Dayal said.

"We are happy that this time it is not proliferating so much because the temperature is high. But after the monsoon there is a chance that it can come again," he added.