CA seeing surge in norovirus cases. The unexpected way it can spread through your householdStomach bugs are pretty common this time of year, but health officials confirm California, including Los Angeles, is experiencing elevated norovirus activity. These types of viruses can spread in a way you might not realize. And that's a sign that it wasn't dried the right way, and you might need to wash your clothes again," he said. And don't forget to sanitize your hamper or wash it if it's cloth.