Australian companies are being increasingly caught in the fallout from the coronavirus outbreak, as a ban on Chinese tourists curbs demand in Australia and manufacturing shutdowns across China hit supply chains.

Vitamins group Blackmores went into a trading halt on the ASX as uncertainty rises over the impact of coronavirus on its China and Australian business, while electronics retailer JB Hi-Fi says it will use its market clout to ensure it has first access to electronics goods and mobile phones if Chinese manufacturers started to be squeezed.