Some say the reason for Norovirus in Namhae oysters is the lack of typhoons in recent years

I saw a comment left by an oyster farmer
They claim that even though aquaculture farms are monitoring and educating foreign workers regarding restroom usage,
and even though fishing vessels are prohibited from departing or operating if they aren't equipped with proper restrooms,
the reason "fecal oysters" keep occurring
is because the Norovirus remains continuously in the seawater.
They argue that because typhoons haven't mixed things up, the virus remains latent in the water.